I have hsd ovarian cysts for the past 5 yrs, the majority of them are water filled and can pop on their own. If they do rupture it can be pretty painful, in that case I take 800 mg of IBP. I am currently 8w 3d pregnant with my second child, when I was pregnant with my first I had a cysts the size of a grapefruit that encased my left ovary. I delivered my daughter and then had surgery to have it removed, it wasnt water filled needless to say. I have never had any other issues like that since then, and doctors say they are pretty common, most women just don't realize that's what they are feeling. Ask your doc for some tips on soothing the pain, good luck!
My husband and I had been trying to get pregnant for a year... And found out I had an unusually large ovarian cyst 16cm... The doctors were trying to push off surgery and just let it do its own thing. I ended up having it removed and a few months later found out we are pregnant!! Anyway, I doubt that Tue cyst will affect anything with your pregnancy. Good luck... Those things can be painful on the back!