Starting last night I was having pain in my pelvic area it was pretty sharp and constant it finally stopped and i was able to go back to sleep, it kind of felt like when i had an ovarian cyst well today it has continued to hurt on and off, now i am getting extremely sharp pains in my side also, its on my left side and pelvic area. It even seems like when i breathe in i hurts worse. What could it be? Should I go to the ER or wait and see if it gets better?