The gestational sac is the structure surrounding the fetus early in pregnancy and its shape early in pregnancy (usually before 8-10 weeks) is important. Ideally, the gestational sac should be round. But other shapes can also be normal, and there is no sure way of predicting what it means. When it's found to be abnormally shaped, the sac should be monitored to make sure everything is OK. Within 1-2 weeks after the last exam of the gestational sac you should be able to see the fetal heartbeat, which is the best indication that the fetus is doing fine.