It can happen before, during, and after my period. It s always very sharp, but not always in the same spot. Sometimes it starts a little under my bellybutton then radiates down a couple of inches. Other times it ll just be in one spot, like either around my left or right ovary or right in the center. The most unusual pain is when it starts around my urethral/vaginal opening (everything is so close down there, it s hard to tell where it s starting from exactly) and radiates upwards. I had an external ultrasound a couple months ago and everything looked normal. I ve heard that external ultrasounds can miss things. Is it possible that this pain is being caused by some sort of problem missed by the ultrasound, not just normal cramps?