I was found to have a 3cm cyst on my ovary at 5 weeks preg, had a scan at 7weeks and it was 8 cm. then at my 12 week scan they were concerned as it was aprox 12 cm and had blood flow. I was booked to have it removed at 16 weeks but the week of the surgery I had excruciating pain so was rushed into emergency surgery to have it removed. Turned out the cyst was 20cm and burst as they were removing it. They had to take the ovary and tube and I have a huge scar from my pubic line to my belly button. They tested the cyst and it turned out to be cancer. I had 5 rounds of a lower strength chemo while pregnant which was very scary as they really didn't know what effect it would have on my bub. It was all good news though as my son was born beautiful and perfect at 38 weeks. Moral of the story is, it is amazing what some babies can get through and having a cyst can still result in a beautiful healthy baby, even if there are some hurdles along the way! Please don't worry though, my doctors told me that the situation was so rare that they really didn't have a lot of past evidence to go by as ovarian cancer is very rare for someone so young (I was 28) and pregnant. The only negative effect has been that the chemo aged my remaining ovary to the age of a 40+ year old so we were recommended to use IVF to get pregnant again. I have to have a full hysterectomy 6 months after my bub is born just to ensure I don't get it again, so it's all good. I really hope your cyst behaves and doesn't cause any issues for your pregnancy.