Clinically, there is no such thing as a gestational sac, but the development of the embryo can be reflected by the gestational sac. After the fertilization of the egg, the gestational sac begins to develop, and there is no relationship with the sex, with the development of the embryo, the gestational sac can be gradually enlarged, you can judge the development of the embryo through the size of the gestational sac, such as the gestational sac is smaller than the same level of gestational weeks, suggesting that the embryo is not well developed; if the gestational sac is larger than the same level of gestational weeks, you should calibrate the week of gestation again. Timely monitoring of the development of the gestational sac can promptly detect abnormal embryonic development, which may lead to the risk of miscarriage, and the pregnant woman can weigh the pros and cons and then terminate the pregnancy in a timely manner. Patients who find abnormalities in the gestational sac during prenatal checkups should seek medical attention as soon as possible to avoid delays that could lead to adverse consequences.