Hi my sister did IVF and she is 6 weeks pregnant. Her doctor told her the Yolk Sac is bigger than Gestational Sac. Is that usually normal? Source: H

Some confusion. I think something got lost in translation somewhere: the yolk sac is contained inside the gestational sac, so it's not possible for the thing inside to be bigger than the thing outside. The doctor may mean "bigger than expected" or "smaller than expected." I hope this helps.