Generally, you can see the gestational sac in about 35 days of pregnancy, but the time of conception is different for everyone, and the time of fertilization of the egg is also different, so there will be a certain error in time, but it will not exceed 50 days at the latest. During pregnancy, if there is no discomfort, it is better to go for ultrasound examination in about 7 weeks, not only can you see the gestational sac, but also the fetal heart and fetal bud. In the early stage of pregnancy, the size and regularity of the gestational sac represent the quality of embryonic development. If the gestational sac is full and regular, it means that the embryo is developing well; on the contrary, if the gestational sac is small and irregular in shape, it may be caused by late conception or the embryo itself may be of poor quality causing the embryo to develop poorly and needs to be treated with birth control. In the early stage of pregnancy, you must pay attention to rest, avoid too much exertion and do not eat cold and stimulating food.