Ohh!just bring it up to your doctor! Theres so many things in there that we see and have no idea what you're looking at.
It does disappear but its not uncommon to still see it anywhere from 14-20 weeks... when did you get the ultrasound?
I thought the yolk sac disappears though after like 12 weeks? I'm 22 weeks
I would ask but there is a yolk sac in the amniotic sac, i dont believe its IN the placenta but its a solid circle in the ultrasound. If it wasn't addressed, I wouldn't worry but do mention it to your doctor to calm your nerves (:
Hm. My doctors have always been very open with communication. If I'm concerned, they make sure to address it to the full extent. Maybe at your next appointment, address it more seriously so they'll understand you are concerned. If that was my doctor, I would switch, but that's just me.
Usually the doctors would address it with you if it is something serious. But, if you're concerned, ask questions. Don't be afraid to step up and ask, "hey, I noticed the circle in my placenta and I'm wondering if it's something I should be concerned about?"