My boyfriend and I have been having unprotected sex a lot because we want a child. I was a week late for my period and the pregnancy test said negative. Today I might have started my period but it might be implantation bleeding if I am pregnant. My period is never that late, I really can't tell if I'm pregnant or not.
Go to the doctors, they are the only ones who can tell for sure. Pregnancy tests are not accurate all the time.