What’re the chances

Em

Long story short me and my OH we’re messing around and he ended up finishing inside me. I didn’t think there’d be any problem because I’m on the pill at pretty religious at taking it and have never had any problems before (this was the weekend of the 1st of Feb) I had a very stressful night and for the first time ever forgot to take my pill on the Thursday (7th of Feb) so I took both pills on Friday (as docs told me too) but I began bleeding and experiencing cramps Saturday night into Sunday and it’s now Tuesday (12th) and the bleeding hasn’t stopped.

It’s not like period blood either it’s brown and horrible which is why I’m even more confused. I took a test the Sunday morning which came back negative but I’m not supposed to finish my pill pack until the (14th) so unsure as to whether that would a difference.

Basically (I know there’s a chance) but could I be pregnant? or is something wrong?