Hi guys my name's Sarah and I haven't had my period since August and I have sore/hard nipples and…

Hi guys my name's Sarah and I haven't had my period since August and I have sore/hard nipples and when I push on the area right above my pelvic bone it cause pain and it hurts also when I stand up. Me and my boyfriend have been having unprotected sex. I took a blood test and a simple pregnancy test and and the hospital and they came back negative and I took several pee stick test and again negative. Im experiencing the symptoms of the first week pregnancy so I'm confused. HELP!!!!!