So I had my period Feb 11-16. I'm always on time. And my boyfriend and I have been having sex no condom. But he pulls out. I am 11 days late on period. And tests are coming negative. Even took a blood test yesterday and negative. Anyone know what it could be ?! Should I wait and just see ? Or any advice on what might be going on. Never been pregnant before so I'm not sure what to except if I am or not. About 5 days ago. I was having very bad cramps in my uterus not like period cramps. It hurt so bad I could barely walk. But I woke up the next morning and it was gone. Help.