I am on birth control, this is my 2nd month on necon 1/35, my boyfriend and I always have protected sex. lately iv been having sharp stomach pains. not just in the uterus area, mainly around my naval. and barley slight cramping like period cramps. I got something like a period that lasted 3 days, and was heavy for 1 of those days. I'm so stressed about this, I don't know if stress is causing this. I also took a HPT a week or so ago and it came out negative