I have a cyst

So at my 7 week scan, I had a cyst. My gyn said the baby was feeding on it and nothing to worry about. At 9 weeks, the cyst was still present and looked the same size. She asked me if I have pain and I only get sharp pains if I do a bad twist or turn. She told me if I get extreme pain, I should rush to her immediately. I asked how much pain because all my pregnancies, I always have round ligaments pains. She said this kind of pain I will know. Which is all kind of scary. Usually am not home worried about the baby but every time I go in, I leave concerned that sth is wrong. It’s the first pregnancy with a cyst. She said in other women it ain’t as big. We just have to watch it.

My question is. Does this endanger the baby? When does the cyst disappear?