Can I see the gestational sac at 36 days of pregnancy? On the 36th day of pregnancy, the fetus has just begun to form. If you perform a routine B-ultrasound examination at this time, you can see the gestational sac. The gestational sac is a liquid package formed by the baby\’s growth in the uterus. Due to its small diameter, it is easy to be ignored, so special attention should be paid during the early pregnancy check-up. What issues should be paid attention to during the early pregnancy test? 1. Choose the right time: In early pregnancy, the fetus has not yet formed. By checking the gestational sac, you can monitor and find existing problems in the early stages of the baby\’s growth. usually