How do you calculate a due date for a 5 day transfer?

Add 261 days to the transfer date. That is 266 days of expected pregnancy from conception, minus the 5 days the blastocyst had already grown in the lab.

How many weeks pregnant am I on the day of a 5 day transfer?

You are counted as 2 weeks and 5 days pregnant. IVF dating starts 14 days before egg retrieval, and the embryo adds another 5 days.

When can I test after a 5 day transfer?

A home test is usually reliable from about 9 days past a 5 day transfer (9dp5dt), and clinics normally run the first beta hCG between 9 and 11 days past transfer.

Is a 5 day transfer due date different for a frozen blastocyst?

No. A frozen day-5 blastocyst is dated exactly like a fresh one, because dating depends on the embryo's age at transfer rather than on when it was created or thawed.

Why is my 5 day transfer due date two days earlier than my friend's day-3 transfer?

A day-5 embryo is two days older than a day-3 embryo at the moment of transfer, so the pregnancy is already two days further along on the same calendar date.

5 Day Transfer Due Date Calculator

Enter the date of your day-5 blastocyst transfer to see your estimated due date, how many weeks pregnant you are counted as today, and the usual test and scan dates that follow.

Embryo transfer date

Estimated due date

Tuesday, June 15, 2027

Transfer date + 261 days. On transfer day you are counted as 2w 5d pregnant. Fresh or frozen day-5 blastocysts use the same date.

This is an estimate for information only — only about 1 in 20 babies arrive on their due date. Always confirm dates with your midwife or doctor.

What happens after a day-5 transfer

Typical timings for a transfer on Sunday, September 27, 2026. Your clinic's own schedule always takes priority.

Milestone	Day past transfer	Gestational age	Date
Transfer day	—	2w 5d	Sunday, September 27, 2026
Earliest reliable home test	9dp5dt	4w 0d	Tuesday, October 6, 2026
First beta hCG (typical)	10dp5dt	4w 1d	Wednesday, October 7, 2026
Second beta hCG (typical)	12dp5dt	4w 3d	Friday, October 9, 2026
First ultrasound (typical)	21dp5dt	5w 5d	Sunday, October 18, 2026

The day-5 formula

A full-term pregnancy is 266 days from conception. A day-5 blastocyst has already used five of those days in the incubator, so the due date is the transfer date plus 261 days.

That is the entire calculation. There is no adjustment for cycle length, because an IVF cycle does not depend on when you ovulated — the lab knows exactly how old the embryo is.

Why day-5 is the most common transfer day

By day 5 an embryo has reached the blastocyst stage, with a clear inner cell mass and outer trophectoderm. Embryos that reach this point have already passed a natural selection step, which is why most clinics now culture to day 5 before transferring or freezing.

It also matches nature more closely: in a spontaneous conception, the embryo arrives in the uterus around day 5 after fertilisation. Transferring at that stage lines the embryo up with the endometrium's own window of receptivity.

Reading the two-week wait in DP5DT

IVF clinics and forums count in days past a 5 day transfer, written as dp5dt. 6dp5dt means six days after the transfer, which is equivalent to 11 days past ovulation in a natural cycle.

Implantation usually completes between 1dp5dt and 4dp5dt, hCG becomes detectable in blood around 5-7dp5dt, and on a home test around 8-10dp5dt. Testing earlier than that is not a reliable signal either way.

When the date might move

Most clinics keep the IVF due date even when an early scan measures a few days ahead or behind, because the transfer date is a known fact while a crown-rump length measurement carries its own margin of error.

If a scan differs by more than about a week, your clinic may re-date the pregnancy. That is uncommon after IVF and is a conversation to have with them rather than with a calculator.

Other transfer days

More IVF calculators

All IVF calculators & guides →