IVF Due Date Calculator

Natural: LMP used (assumes ovulation day 14). IVF: based on exact egg retrieval/fertilization day (more precise). Due date earlier by ~2 weeks vs LMP-based if using retrieval date.

Yes. Day 3 embryo transfer = 263 days to due date. Day 5 blastocyst = 261 days. Frozen embryos = date of thaw. Ultrasound dating (week 8–13) confirms, can vary ±3–5 days.

Ultrasound 6–7 weeks from retrieval (5–6 weeks from transfer). Transvaginal ultrasound shows earlier. Early ultrasounds (5–6 weeks) may not show heartbeat yet; recheck at 7 weeks.