Baby 2

Natural Conception

Evidence-based odds, preparation, and timing · Andrea (39→40) & Adam (42→43)
Per Cycle
6–10%
live birth rate
3 Months
20–30%
cumulative
6 Months
35–47%
cumulative
📊 Your Numbers

These estimates account for Andrea's age (40), Adam's age (43), DOR diagnosis, and the positive signal of having conceived Nathan naturally.

Conception Rates Per Cycle

EstimateConceptionLive Birth (adj. for miscarriage)
Optimistic10–12%~8%
Realistic8–10%~6–7%
Conservative5–8%~4–5%

Cumulative Over Time (8–10% per cycle)

TimeframeConception ChanceLive Birth Chance
3 months22–27%~20–25%
6 months39–47%~30–35%
12 months63–72%~45–55%

Miscarriage & Chromosomal Risk at 40

Miscarriage rate~30–35% of recognized pregnancies (1 in 3). Predominantly due to chromosomal aneuploidy.
Down syndrome risk~1 in 100 (1%) at birth
Any chromosomal abnormality~1 in 50–60 at amniocentesis
Aneuploid embryos~40–50% of all embryos at age 40
Prenatal screeningNIPT (cell-free DNA) available from ~10 weeks. Standard of care at this age.
For comparison — IVF at this age with DOR: Live birth rate per transfer is ~15–25%, per cycle start ~10–18%. Natural conception per cycle (~6–10%) is modestly lower but in the same ballpark, especially when egg yield from stimulation is low. IVF's main advantage is PGT-A screening to reduce miscarriage, but with low AFC, there may not be enough embryos to screen.
🔄 Conceiving Naturally After IVF
This is real and documented. 10–20% of couples who undergo IVF conceive spontaneously afterward, with the highest rates in the first 1–3 months post-cycle.

The Evidence

StudySampleKey Finding
Troude et al. 20122,134 couples (France)17% conceived spontaneously within a few years after stopping IVF. Highest in unexplained infertility (~24%).
Smith et al. 201612,785 couples (UK)15–20% spontaneous conception in couples who stopped IVF, cumulative over 5+ years.
Shimizu et al. 2009435 couples (Japan)11.7% spontaneous pregnancy after failed IVF. Most within 6 months, concentrated in first 1–3 months.
Hennelly et al. 20002,133 couples~5% conceived spontaneously between IVF cycles.
Levi-Setti et al. 2006Case seriesDocumented pregnancies in "rest cycles" between IVF attempts — supports the idea of a post-stimulation fertile window.

Why Does This Happen?

No single proven mechanism, but hypotheses include:

  • Residual follicle recruitment: Ovarian stimulation may recruit follicles that continue maturing in subsequent natural cycles
  • Hormonal reset: The cycle after stimulation may have improved endometrial receptivity
  • Lingering progesterone effect: Supplementation during IVF may benefit the uterine environment in the following cycle
  • Statistical reality: Couples with nonzero monthly fecundity will, given enough time, sometimes conceive. The more cycles attempted, the more likely.

What This Means for Andrea & Adam

  • The first 1–3 months after the failed Grace Fertility cycle (i.e., right now, April–June 2026) may be a modestly more fertile window
  • The post-IVF conception phenomenon is strongest in unexplained infertility and weakest in tubal factor or severe male factor
  • For DOR specifically, the data is thin but not zero — a small Israeli retrospective (Bentov 2010) noted spontaneous conceptions in poor responders
  • This is additional reason to start trying naturally now rather than waiting for the next IVF cycle
Bottom line: The failed IVF cycle is not wasted time. The stimulation may have primed the system, and the months immediately following are worth trying naturally with intent. This overlaps perfectly with the 3–4 month natural trying window before pivoting to European IVF.
🧬 DOR & Natural Conception
Key finding: AFC and AMH predict IVF response (egg yield), but do NOT predict natural conception rates. This is one of the most important distinctions in reproductive medicine.

The evidence:

  • Steiner et al. (2017, JAMA): 750 women aged 30–44. Women with low AMH (<0.7 ng/mL) had no significant reduction in natural fecundability. After 12 cycles, 65% with low AMH conceived vs. 62% with normal AMH.
  • ASRM Committee Opinion (2020): AMH and AFC "should not be used to predict natural fertility."
  • Biological reason: In a natural cycle, only ONE follicle is recruited regardless of how many antral follicles are present. Low AFC = fewer raw material for IVF stimulation, but the dominant follicle selection process is unaffected.

What DOR does mean: The window of remaining fertility may be shorter. Monthly odds may be similar, but the total reproductive years remaining are likely fewer. The "runway" is shorter, not the "speed."

Proven fertility matters: Having conceived Nathan naturally is a significant positive signal. Leridon (2004) estimated women with proven prior fertility have ~50% higher per-cycle fecundability than never-pregnant women at the same age. However, Nathan was conceived at ~37–38, and 2+ years of ovarian aging since then is real.
🎯 What Affects the Odds

Andrea (Female Age — Dominant Factor)

  • Age is the #1 variable and is not modifiable. Everything else is secondary.
  • Regular cycles (25–35 days) = strong sign she is ovulating consistently
  • Cycles getting shorter can indicate diminishing reserve (follicular phase shortens)
  • Only needs one chromosomally normal egg per cycle

Adam (Male Factor at 43)

  • Standard semen analysis normal at Grace Fertility — reassuring for basics
  • Sperm DNA fragmentation is the bigger concern at 43 — increases with age, NOT detected by standard semen analysis
  • Elevated fragmentation can cause failed fertilization, poor embryo development, early miscarriage
  • May have contributed to the IVF failure (6 fertilized, none implanted)
⚠️ Action item: If not already done, request a sperm DNA fragmentation test (SCSA or TUNEL assay) for Adam. This is the single most informative additional test. It informs both natural conception prognosis and IVF protocol decisions.

Paternal Age Effects (Small but Real)

  • Small increased risk of autism spectrum disorder (~1.5% → ~3%), schizophrenia at paternal age 40+
  • Absolute risks remain low
  • Not detectable by standard prenatal screening (NIPT screens for chromosomal, not paternal-age-related conditions)
💊 Supplements — Evidence-Based Only

For Andrea

CoQ10 / Ubiquinol Strong Rationale
400–600mg CoQ10/day, or 200–400mg ubiquinol (better absorbed)
Mitochondrial function in oocytes declines with age. CoQ10 is a key component. Mouse studies showed reversal of age-related quality decline (Ben-Meir 2015). Human RCT data limited but suggestive. Excellent safety. Take it.
Methylfolate Essential
800–1,000mcg/day
Non-negotiable. Prevents neural tube defects. Start at least 1 month (ideally 3) before conception. Methylfolate (5-MTHF) preferred over folic acid — bypasses MTHFR variants that ~30–40% of people carry.
Vitamin D Test First
2,000–4,000 IU/day (adjust based on levels)
Deficiency associated with reduced fertility (Chu 2018 meta-analysis). Get levels tested — target 75–125 nmol/L. Especially relevant in Vancouver with limited sun.
Omega-3 (DHA/EPA) Moderate Evidence
1–2g combined EPA+DHA daily
Modest fertility evidence, stronger evidence for pregnancy outcomes (reduced preterm birth) and fetal brain development.
Melatonin Moderate Evidence
3mg at bedtime
Improved oocyte quality in IVF patients by reducing oxidative stress (Tamura 2012, 2014). Also helps sleep. Very safe.
DHEA Doctor Supervised
25mg 3x daily (75mg/day) — if prescribed
May improve ovarian response in DOR. Evidence is mixed (Cochrane: insufficient). More relevant for IVF prep than natural conception. Side effects include acne, oily skin, facial hair, mood changes. Discuss with Dr. Cheung.

For Adam

CoQ10 Strong Evidence
200–400mg/day
Multiple RCTs show improved sperm motility and concentration (Safarinejad 2009, 2012).
Zinc + Selenium + Folic Acid Moderate Evidence
Zinc 30–50mg, Selenium 100–200mcg, Folate 400–800mcg/day
Zinc is essential for spermatogenesis. Selenium important for motility. Folic acid + zinc improved concentration (Wong 2002). Low cost, low risk.
Vitamin C + E Moderate Evidence
Vitamin C 500–1,000mg, Vitamin E 400 IU
Antioxidants with modest evidence for improved DNA fragmentation and sperm parameters.
Practical shortcut for Adam: A quality male fertility multivitamin (e.g., Fertilaid for Men, or Thorne Men's Multi) plus additional CoQ10 200–400mg covers most of this in 2 pills.
⏱️ Timing & Tracking

Ovulation Predictor Kits (OPKs) — Primary Tool

  • Detect LH surge ~24–36 hours before ovulation
  • Start testing daily around cycle day 10 (or 3–4 days before expected ovulation)
  • When positive: have intercourse that day and the next day
  • Clearblue Digital Advanced also detects estrogen rise, giving a wider fertile window
  • Bulk cheapie strips + digital reader (Premom app) is a cost-effective alternative

Cervical Mucus — Secondary Signal

  • Stretchy, clear, egg-white mucus = approaching ovulation
  • Free, reasonably accurate. Best used alongside OPKs.

Basal Body Temperature (BBT) — Optional

  • Confirms ovulation after the fact (temp rise of ~0.3–0.5°C after ovulation)
  • Useful for pattern recognition over months, NOT for real-time timing
  • By the time temp rises, the fertile window has already passed

Optimal Intercourse

Fertile window~5 days before ovulation through the day of ovulation
Highest probabilityDay of ovulation + 1–2 days before
FrequencyEvery 1–2 days during the fertile window. Daily is fine — does NOT reduce sperm quality in men with normal parameters.
Sperm survival3–5 days in the reproductive tract
Egg viability12–24 hours after ovulation only
Recommended approach: OPKs as primary tool, cervical mucus as secondary, BBT optionally for pattern tracking. Log everything in Fertility Friend or Premom app.
🌿 Lifestyle — What the Evidence Actually Says
FactorEvidenceRecommendation
Caffeine<200–300mg/day has no meaningful effect1–2 cups of coffee/day. Don't stress about it.
AlcoholHarm above ~7 drinks/week. Light drinking evidence is mixed.Minimize. Zero in the TWW (after ovulation). Occasional glass of wine is not a crisis.
ExerciseModerate (150–300 min/week) is beneficial. Extreme intensity can suppress ovulation.Keep active, don't overtrain.
DietBest evidence for Mediterranean pattern (Karayiannis 2017). No specific "fertility diet" beyond this.Vegetables, fruits, whole grains, fish, olive oil, legumes.
Sleep<6 hrs or >9 hrs associated with reduced fertility7–8 hours consistently.
SmokingMost damaging modifiable factor. Accelerates ovarian aging 1–4 years.Neither partner smokes — good.
BMI20–25 is optimal. Both under and overweight reduce fecundability.If in normal range, not a concern.
StressChronic severe distress may have modest effect. Normal life stress probably does not. "Just relax" is not evidence-based.Manage stress for wellbeing, not as a fertility treatment. Do not add guilt about stress to your stress.
Heat (Adam)Scrotal hyperthermia reduces semen quality. Takes 2–3 months to see improvement.Avoid hot tubs/saunas, switch to boxers, no laptop directly on lap.
✅ Action Plan

Start This Week

  • Andrea's supplements: Ubiquinol 400mg, Methylfolate 800mcg, Vitamin D 2,000–4,000 IU, Omega-3 1–2g, Melatonin 3mg
  • Adam's supplements: CoQ10 200–400mg, male fertility multi (zinc, selenium, folate, C, E), or individual supplements
  • Order OPKs — Clearblue Digital Advanced or bulk cheapies + Premom app
  • Adam: switch to boxers, avoid hot tubs/saunas, no laptop on lap

This Month

  • Request sperm DNA fragmentation test for Adam — informs prognosis and may explain part of the IVF failure
  • Begin tracking ovulation with OPKs. Intercourse every 1–2 days during the fertile window.
  • Discuss DHEA with Dr. Cheung at the Apr 6 call (more relevant if planning more IVF)
  • Get Vitamin D levels tested

Parallel Track: Natural + IVF

  • Natural trying and IVF preparation are NOT mutually exclusive
  • Supplements that improve egg quality for natural conception also improve IVF outcomes
  • Tracking cycles generates data useful for IVF timing too
  • Continue European clinic consultations in parallel
  • If pregnancy occurs naturally during IVF prep — cancel the cycle
⚠️ Set a decision point: Try naturally for 3–4 months with optimized timing and supplements. If not pregnant, proceed with IVF. Do NOT try for 12 months open-ended — at 40, the opportunity cost of time is too high. Every month that passes reduces the odds slightly.

The Honest Comparison

NaturalIVF (at 40, low AFC)
Per cycle live birth~6–10%~10–18% (per cycle start)
Cost per cycle~$0 (supplements only)$6,500–25,000 CAD
PGT-A screeningNo (NIPT at ~10 weeks instead)Yes (reduces miscarriage)
Emotional burdenLowerHigher
Time commitmentMinimalWeeks per cycle
⛔ Myths to Ignore
✕ "Legs up after sex" — No evidence. Sperm reach the cervix within seconds. Gravity is irrelevant at the microscopic scale.
✕ "Specific positions improve conception" — No evidence for any position being superior.
✕ "Pineapple core aids implantation" — Persistent internet myth. Zero clinical evidence. The bromelain in dietary pineapple is pharmacologically insignificant.
✕ "Acupuncture improves fertility" — Cochrane review and largest RCTs show no significant effect on live birth rates. Fine for relaxation, don't expect it to improve conception.
✕ "Royal jelly / maca root / fertility teas" — No credible evidence for any of these.
✕ "Organic food / 'detox' protocols / avoiding all plastics" — BPA concerns are theoretical. Don't microwave in plastic, but elaborate detox protocols are not evidence-based.
✕ "You need to orgasm to conceive" — The "upsuck theory" is not supported by evidence.
✕ Expensive at-home fertility monitors (Ava, Mira, etc.) — Not superior to standard OPKs. Significantly more expensive for marginal or no benefit.
The biggest risk isn't any myth — it's open-ended waiting. Time is the most important variable at 40. Set a clear window (3–4 months), try with intent, and have the IVF backup plan ready.
↑ Back to top