Don't know what is goin on

Maybe Tmi, but in the past week I have had very sore breasts and tender nipples I also have this odd sharp pain on the right side of my pelvic or uterus idk which to be exact but i can feel it inside my vagina. My stomach feels very stiff after I eat. I took a test today 3/28/15 and it came out negative. Any ideas on what is going on?