Pregnancy after treatment
The gestational sac is usually the earliest structure visible on ultrasound, often from around four and a half to five weeks. Its presence in the womb confirms the pregnancy is in the right place, though the yolk sac and fetal pole follow before a heartbeat can be seen.
Also known as: pregnancy sac
Related South Africa guides
Sources
- ESHRE guidelines and patient information
Last reviewed: 8 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.