Unprotected Sex On New Years Eve, Drunken Mistake Need Some Advice Or Something.

I had unprotected sex on New years eve, he didn't *** in me but there may have been pre-***. I did not take the pill. I started my period 2 days afterwards, however, it has lasted much longer than usual and it did stop and then I went to the bathroom and there was small amounts of light red blood. I was reading and I thought this could indicate implantation bleeding? From what I have said could you please advise me on if I am pregnant or not? I am freaking out.
An Ep User An EP User
Jan 8, 2013