About a month and a half ago, I had an ultrasound that revealed I had an ovarian cancer. I was suppose to follow up with a doctor after my next menstrual cycle, but I didn't. Yeah, stupid me. My cycle passed and I didn't feel anymore back or abdominal pain. I felt fine. Well, now I'm late for my cycle and I am typically never late. I even did a pregnancy test thinking there might be a small chance that I was, but the results were negative. So once someone has an ovarian cyst, will this change their menstruation cycle? Or should I be worried?