The main difference between a round or oval shaped gestational sac is the shape, other than that there is not much difference, generally speaking, they are all normally developed gestational sacs, because the morphology of the different angles of section is different. As long as the yolk sac is well-developed and the embryo is visible with the increase of gestational weeks, and the heart tube is pulsating, then the gestational sac can be said to be well-developed. With the increase of gestational weeks, some pregnant women may experience abdominal pain and miscarriage, at this time, we should pay attention to observe the development of the embryo and the gestational sac. If it is a pre-eclampsia timely birth control, the shape of the gestational sac does not change much; if it is difficult to avoid miscarriage, then the embryo stops developing, the gestational sac collapses irregularly, and even in the uterine cavity of the position of the downward shift, this time the need for timely treatment of the uterus, to avoid staying too long to lead to uterine cavity infection. If you feel discomfort in the lower abdomen, we recommend that you go to the hospital as soon as possible to complete the examination, to understand the development of the embryo and the gestational sac, clear reasons for symptomatic treatment, so as not to delay and cause adverse effects.