Maybe I don't know?

This is probably a waste of a post....Since I am probably being silly.
So I am trying to conceive at the moment, and this month I have done two neg tests since the last time my partner and I had sex (31st of October I know cause I had just got our of hospital and didn't feel like having sex but I was ovulating) and had my period. I have a lack of faith in tests due to the fact until my mother was 5 months pregnant with me her urine tests were coming negative.  I had previously (till about five minutes ago) accepted the fact that November wasn't our month.  I was getting dressed for  MrMerwens' twenty first, and I noticed a bruise (right around) around my nipples (TMI sorry!) and I know for a fact there is know reason for there to be a bruise there. Like a solid dark brown bruise. Then my brain kicked, thinking about how I had been feeling off, and that disgusting taste that was still hanging around my mouth...
Could I be pregnant even after all that? Or is this just some kind of freak occurence?
MrsHolly