6 days late. Help!

Jean

I’m now six days late. I don’t remember the last time I had sex, but it was definitely in this last cycle. We use condoms every time and he pulls out before he comes. I noticed two teeny tiny (like really small) dots of blood about three or four days ago, which I thought was my period starting but it wasn’t. I took a test about 2-3 days ago and it came up negative. Any ideas as to what could be going on?