My right one hurt like hell my second pregnancy. I had a 6 cm by 7 cm cyst on it for over half the pregnancy. This time I only had smaller cysts, and they hurt, too. But they're mostly gone now. For some reason my cysts hurt during pregnancy. They don't or don't much when I'm not.
Mine hurt all the time, and I have felt like some of the cysts have ruptured (they did all the time before pregnancy to) It adds to my fears since I have had so many miscarriages, but I was told they wouldn't hurt the baby.