
The "sac" (big concentric circles) as the doctor describes "it".
One of the first ultrasounds we had was to ensure that the "sac" was in the uterus.
The picture is the ultrasound done at 6 weeks. The small circular mass inside the sac is the embryo. When the ultrasound was done you could see a rapid flickering within the embryo, that was the heartbeat. Yes, this is how life starts.