No gestational sac was seen on ultrasound

Most women can already see the gestational sac when they are more than 40 days pregnant, and at this time, the shape and size of the gestational sac can be seen through B-ultrasound examination. However, some women may not find the gestational sac after B-ultrasound. At this time, it is likely that the woman has an ectopic pregnancy or is not pregnant. So why is there no gestational sac?

What is a gestational sac

The gestational sac is the initial form of pregnancy. It is a small embryo wrapped in the original placental tissue by the amniotic membrane and vascular network. The fetus had not yet formed at that time, but the fetal heartbeat was already there when the embryo bud appeared. The gestational sac is very small at first and then grows slowly. Generally speaking, after 5 weeks of pregnancy, a small gestational sac can be seen on B-ultrasound, which occupies less than 1/4 of the uterine cavity, or a fetal bud can be seen. If it is a normal intrauterine pregnancy, the gestational sac can be seen in the uterus through B-ultrasound around 40 days of pregnancy. However, due to individual differences in the time of conception, some pregnant women may not be able to see it until around 45 days.

What does it mean when no gestational sac is seen?

1. If the menstruation is simply delayed but the patient has not been to the hospital for a blood HCG test, and the B-ultrasound shows that there is no gestational sac in the uterine cavity, it may be that the patient is not pregnant.

2. When the blood HCG test is positive, confirming pregnancy, but the B-ultrasound shows no gestational sac in the uterine cavity, this may be an ectopic pregnancy or threatened abortion. Because after 40 days of pregnancy, the gestational sac can be seen in the uterus at 35 days in some cases. If it is not seen by B-ultrasound, it means that it is not in the uterus, but may be in the fallopian tube or somewhere else, so there is a possibility of ectopic pregnancy.

The above is the editor’s compilation of relevant information on the question of what it means when no gestational sac is seen in the uterine cavity. I hope it can help everyone. If after the pregnancy is confirmed, no gestational sac is found during B-ultrasound examination, pregnant mothers should take it seriously, but do not need to worry too much. You can wait until about 45 days of pregnancy and go to the hospital for a follow-up examination. If bleeding occurs, go to the hospital for medical treatment in time.