How do I calculate the due date?

Although its duration can vary widely for each woman due to certain factors, labour usually starts at any moment from weeks 38 to 42. When it is a natural conception, the weeks are counted according to the first day of the last period, but if you want to know how to calculate the due date after IVF, we will explain it in this post.

Many women that become pregnant as a result of a fertility treatment wonder how the estimations are made, both on pregnancy weeks and the expected due date, since it is different to a natural pregnancy.

Implantation is taken into account in an IVF pregnancy, since fertilisation is performed in the laboratory about 48 hours beforehand. Therefore, it does not follow the natural route of a fertilised egg, which takes about 7 days to implant itself inside the uterus. In these cases, the right thing to do is count from the day of implantation and, to calculate the probable due date, add 270 to this day instead of the usual 280 or 38 weeks.

It is important to remember that the due date after the transfer is approximate. Only a very small percentage of women give birth on the due date set by the doctor.

We help you answer your questions