I'm worried

I had sex Saturday night and the condom broke and like I was freaked out but he hadn't done anything yet so we just out a new one on. Keeping in mind that I have no idea when my periods will come I started a little bit of bleeding these last few days but it's very very light. I always have heavy periods. Could it be my period was so close and having sex messed it up or could it be that I'm pregnant? I took a test yesterday and it said negative but my boyfriend said that it was inaccurate most likely because I took it too soon. I don't know what to do ..