Blood after sex

We have been ttc since October. I took a test Nov 3rd BFN with af being 5 days late. It was a weird period. Not as much bleeding as usual. Today I’m ovulating and was at my highest chance of getting pregnant! I with to the bathroom like 2-3 hrs after and wiped with a little blood. It was NOT rough sex at all. Even though I had BFN I still have weird “could be pregnant” symptoms. Is it possible to have a BFN and still be pregnant. ?? Tia