A member asked:

Generational sac measuring at 7w3d 2 egg yolks measuring at 5w 3d only 1 heartbeat thought to be seen i started birth control 5w 4d ago and also had taken the plan b 2 days after starting birth control. what could be going on?

A doctor has provided 1 answer

Likely started: as twins, now just one remaining, this actually is much more common, than was known in the era before ultrasounds. Vanishing twin.

Answered 11/29/2019

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Thank

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