What's wrong with the gestational sac growing and shrinking on the 37th day of blastocyst transplantation? Because of infertility, I am the first generation IVF assisted pregnancy. After IVF, there are a large number of embryos, and the doctor suggests that we keep blastocysts. Finally, 5 blastocysts were successfully raised. The doctor transplanted one for me, and the rest was frozen. Fortunately, the transplant was successful once. It is now the 37th day of blastocyst transplantation and I went to the hospital for a B-ultrasound to check the development of the fetus. As a result, I found that one side of the blastocyst was larger.

As the gestational sac grows, it also shrinks. If accompanied by symptoms such as dull pain in the lower abdomen and a small amount of vaginal bleeding, it indicates incomplete embryonic development and the possibility of fetal arrest. This may be due to problems with blastocyst chromosome transplantation, or if a woman becomes infected with viruses such as Toxoplasma gondii, cytomegalovirus, herpes simplex virus, rubella virus, etc. after pregnancy. Therefore, if the patient experiences irregular gestational sac size after 37 days of blastocyst transplantation, it is recommended to go to the hospital for a comprehensive examination in a timely manner to identify the cause and receive targeted treatment under the guidance of a doctor.

The 37th day of blastocyst transplantation is equivalent to the 56th day of normal pregnancy, which is around 8 weeks of pregnancy. At this point, the gestational sac can be either elliptical or circular. If the gestational sac contracts while growing, it is mostly abnormal and may be caused by the following factors:

Abnormal embryonic development

Due to luteal dysfunction, endocrine disorders, embryonic chromosomal abnormalities, genetic mutations, etc., Abnormal embryonic development may occur. When the embryo develops abnormally, irregular gestational sacs can appear, for example, the gestational sacs grow while contracting. At this point, it is necessary to go to the hospital for examination and treatment in a timely manner to avoid delaying the condition.

Embryo damage

After 37 days of blastocyst transplantation, due to certain reasons, the embryo stops developing and does not terminate pregnancy in a timely manner. The gestational sac in the uterine cavity does not receive nutritional supply, and its shape will gradually change, with some edges growing and others shrinking. This situation requires immediate artificial abortion, otherwise it can lead to intrauterine infection and even prolonged bleeding.

threatened abortion

If there is a possibility of threatened miscarriage in the embryo, the position of the gestational sac may shift downwards, and its shape may also change, resulting in the phenomenon of the gestational sac growing while shrinking. It is recommended to test for progesterone and chorionic gonadotropin. If progesterone is low, it should be supplemented in a timely manner. After one week of medication, it will be checked again, and ultrasound will also be checked to determine the development of the embryo. What's wrong with the gestational sac growing and shrinking on the 37th day of blastocyst transplantation?