How many weeks is a natural pregnancy equivalent to a 6-day 4bb blastocyst transfer with 52 days? I had an ectopic pregnancy in 21 years. At that time, I had one side of my fallopian tube removed, but I couldn't conceive again. So I went to have an IVF. At that time, I had a long-term plan to promote ovulation, took 12 eggs, and prepared them into a 6-day 4-bb blastocyst. The doctor gave me a transplant, and I successfully became pregnant after the transplant. It's now the 52nd day of IVF, and I'm curious how many days this is equivalent to a normal pregnancy?

The cycle of natural pregnancy usually starts from the last menstrual cycle of a woman, while for in vitro transplantation, the method of calculating pregnancy week starts from the day of transplantation. If the embryo is transplanted on the third day, then add 17 days, which is 52+17, which belongs to 69 days (9-10 weeks) of natural pregnancy. If the embryo is transplanted on the sixth day, then add 20 days, which is 52+20, which belongs to 72 days (about 10 weeks) of natural pregnancy. Pregnant women can calculate their own embryo transfer time, while for those who cannot remember the time clearly, they can calculate based on the size of the fetal heart, embryo bud, and gestational sac under the guidance of a doctor.

There are generally three calculation methods for the gestational age of in vitro transplantation (IVT), namely the conventional IVT day calculation method, B-ultrasound detection method, and HCG numerical analysis method. Pregnant women can choose the appropriate calculation method based on their actual situation, namely:

Test tube transplantation day calculation method

The transfer date of IVF patients is fixed, and due to various ovulation promotion plans and pre transplant endometrial preparation plans that can change the patient's menstrual cycle, the last menstrual period of IVF patients is calculated based on the transfer date and embryonic days. Specifically, if a D3 embryo is transferred, the last menstrual period is the transfer date minus 17 days. If a D5 blastocyst is transferred, the last menstrual period is the transfer date minus 19 days.

B-ultrasound detection method

The B-ultrasound detection method is generally aimed at women with irregular menstruation and forgetting the transplant date. They can go to the hospital for B-ultrasound examination for diagnosis, because the embryo will observe the gestational sac around 5 weeks after implantation, and the fetal heart and embryo buds will appear between 6 and 7 weeks of pregnancy, which can be used to determine the gestational age of the fetus.

HCG numerical analysis method

HCG is produced by the secretion of trophoblast cells after embryo implantation, which generally changes with gestational age. HCG has corresponding normal standards at each gestational age and can also be used to diagnose in vitro transplantation pregnancy. How many weeks is a natural pregnancy equivalent to a 6-day 4bb blastocyst transfer with 52 days?