So lately I've been having these sudden pains in my lower abdomen. They can occur anywhere from just below my belly button to around where my ovaries and Fallopian tubes would be. I did some research and everything brought me to a bunch of pregnancy forums which worried me, but i don't think I'm pregnant since I only had sex once (about 3 weeks ago) and it was with a condom that remained in tact and I got my period a little less than 2 weeks ago and I've taken 2 negative pregnancy tests within the past week. Since I'm pretty much ruling that out, that doesn't seem to leave a whole lot of other possibilities. Pain after a period sounded like it could be endometriosis, since I've always had extremely painful periods that have made me vomit and I've missed school multiple times because of it, but this feels different from the cramps described as a symptom of endometriosis, it doesn't feel like menstural cramping. They're just sudden pains in that reproductive area that occur maybe every 20 seconds and last for less than a second, they're not terribly painful but it's getting pretty annoying. I've had some constipation as well as diarroeah and it seems like I'm urinating more often. Within the past couple days, urinating kind of stings a little bit. Anyone have any ideas of what this could be??