IVF Due Date Calculator

A precision due-date tool designed for IVF moms: supports fresh/frozen blastocyst, cleavage embryo and Day-3/5/6 transfers; intelligently calculates LMP, gestational weeks and prenatal timetable; provides twin / reduction / multiple pregnancy management and labor countdown for one-stop professional guidance.

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Precise IVF Due Date Calculation

Select your transfer type and embryo age; the system will give the most accurate due date and IVF-specific guidance.

Please select the actual transfer surgery date (not oocyte-retrieval day)
Fresh/FET does not affect gestational calculation, shown for reference only
Affects follow-up check-up frequency and full-term standard
Full-term weeks recalculated according to remaining fetuses
Used for IVF risk assessment and personalized advice (optional)

IVF Prenatal Check-up Timeline

A detailed check-up schedule tailored for IVF pregnancies, covering 1st / 2nd / 3rd trimester and multiple-fetus management

Gestational Week Check-up Key IVF Items Remarks
6~7 w 1st visit TVS: confirm IUP, sac number, fetal heart Early screening mandatory for IVF to rule out ectopic & empty sac
8~9 w Review Repeat TVS: confirm viability, measure CRL, verify dating Discrepancy ≤7 days vs transfer date; revise EDD if larger
11~14 w 2nd visit NT scan + first-trimester combined test + chorionicity (twins) Chorionicity must be determined for twins to decide follow-up frequency
15~19 w 3rd visit NIPT or amnio, level-II scan Direct amnio advised for AMA or chromosomal history
Gestational Week Check-up Key IVF Items Remarks
20~24 w 4th visit Anomaly scan + fetal echo + cervical length IVF carries higher cervical incompetence risk; cerclage if ≤25 mm
25~28 w 5th visit OGTT + CBC + ferritin + growth scan OGTT may be brought forward to 24 w in multiples
29~30 w 6th visit Growth scan + UA S/D + NST (multiples) Twins require B-scan every 2 weeks from 28 w
Gestational Week Check-up Key IVF Items Remarks
31~32 w 7th visit Scan (EFW) + UA S/D + NST + GBS culture Assess preterm risk; antenatal corticosteroids if indicated
33~34 w 8th visit Weekly NST + scan review + coagulation profile Multiples may be admitted for expectant management after 34 w
35~36 w 9th visit Scan + UA + NST + delivery-mode counselling Elective delivery for twins advised at 36-37 w
37 w 10th visit Full prepartum assessment + NST + admission criteria Twins reach term at 37 w; singleton may await 38-39 w
38~40 w Weekly NST + AFI + placental function + labor onset Post-term ≥41 w requires induction
Warm reminder: IVF pregnancy is high-risk; check-up frequency is higher than natural conception; multiples, reduction, AMA, cervical incompetence, etc. require extra visits and items per physician advice.

IVF Due Date Calculation Explained

Understand the formula, error sources and correction tips in 3 minutes for peace of mind

Common formulas & when to use
Embryo Type Formula Error Range Remarks
Day-3 Cleavage Transfer date + 263 days ±3 days Fresh or frozen
Day-5 Blastocyst Transfer date + 261 days ±2 days Most commonly used
Day-6 Blastocyst Transfer date + 260 days ±2 days Slightly slower than D5
Why might it still be "inaccurate"?
  • Wrong transfer date recorded (mixing retrieval & transfer)
  • Actual embryo growth speed differs from theoretical age
  • Multiple pregnancy stretches the uterus faster—37 w is term
  • Full-term standard not adjusted after reduction

Tips to improve accuracy

Retrieval ≠ transfer. Fresh embryos are transferred on Day 3 or 5; frozen embryos follow endometrial preparation. Use the date on your surgery record.

CRL is the gold standard. If discrepancy vs transfer calculation >7 days, re-date EDD by ultrasound.

Twins reach term at 37 w; if reduced to singleton use 40 w. System will auto-switch check-up density.

Why choose PreMami IVF Due Date Calculator?

Precise Embryo-age Differentiation

Supports Day-3/5/6 cleavage & blastocyst; automatically applies transfer + (266 - embryo age) formula with ≤3-day error

Fresh & Frozen All Covered

Whether fresh transfer or FET, just enter transfer date & embryo age to get accurate EDD in one click

Multiple Pregnancy & Reduction

Auto-identifies twin/triple transfer, 37-week term reminder, supports recalculation after reduction

IVF-exclusive Check-up Table

Built on reproductive-medicine consensus: early ectopic screening at 6 w, intensive monitoring at 28 w, twin delivery planning at 36 w

IVF Due Date Calculator FAQ

Natural conception: ovulation + 266 days = EDD. Day-5 blastocyst transfer already developed 5 days, so transfer + (266 - 5) = 261 days; Day-3 cleavage uses + (266 - 3) = 263 days, keeping gestational age synchronized with real embryo development.

As long as embryo age is identical (e.g. both D5 blastocyst), frozen and fresh transfers use exactly the same calculation; only endometrial preparation protocol differs, no effect on dating.

Multiple pregnancies over-stretch the uterus and placental function declines earlier; international consensus therefore defines 37 weeks as term for twins to lower risks of intrauterine hypoxia and stillbirth, so delivery is scheduled around 37 w.

After reduction the full-term standard is adjusted to remaining fetuses (singleton 40 w, twins 37 w), but the EDD date itself stays unchanged; visit frequency is replanned according to remaining fetuses—inform your doctor of the reduction week.

TVS measurement of CRL at 6-8 weeks is the gold standard; discrepancy ≤7 days vs transfer calculation is acceptable. If >7 days, re-date EDD by ultrasound and adjust follow-up schedule.

IVF is a high-risk pregnancy requiring early exclusion of ectopic, cervical-length surveillance, and chromosomal screening; multiples also need chorionicity determination and growth-discordance monitoring, so visit frequency is higher than natural conception.

Yes. Generic calculators default to LMP + 280 days and cannot distinguish embryo age; the IVF version applies transfer + (266 - embryo age) precisely, shrinking error to ±3 days and providing twin/reduction-specific management.

Singleton 41 w or twins 38 w without spontaneous labor will be assessed for induction; IVF placentas tend to age slightly earlier, so blind waiting is not recommended—decision should combine NST and AFI.