So sorry to hear you have to face surgery while pregnant. They do seem a bit confused on your u/s. I am guessing, the rapid changes are due to the hormones from your pregnancy. Have you asked your doctor about it? The right cyst seems to have grown a couple of cm and now looks complex versus looking simple on the first scan. The left side is measured slightly less (could be fr/ a difference in how tech measured), but it is large for a follicle cyst. Also, since it was classified as a dermoid before...it must have looked complex on the prior u/s.
Here's the thing...it is probably benign, but any large, complex mass has a chance of being malignant...and you have two. Any time there is a changing cyst that is large and complex, you owe it to yourself to have a consult with a gynecologic oncologist. Are you already seeing one? If not, then ask your gyn to refer you to one before you have any surgery.
The gyn/onc can be there to step in if it looks malignant during surgery and you will have a much better overall prognosis. I don't mean to scare you and it really stinks that you have to face this while pregnant. But, it is best to play it safe. Gyn/oncs have seen so many more unusual cases than a regular gyn. Odds are with you that is benign. I think your hormones are causing the changes. But, even benign cysts can be life threatening to you and the baby if they rupture.
My gyn's nurse had surgery to remove a teratoma when she was in her third trimester and it was benign. She and baby were fine. It was a very scary situation because of the waiting and wondering. I'll be praying for you. Keep us posted!
hi charmaine wish i could advise but i cant had a dermoid but wasent preggers i know some ladies on the forum had simaler issues and will advise keep posted and good luck with your baby x