Confused! Help!

Kat

I am 3 days late for my period and I have take 2 pregnancy tests and both are negative. I had sex everyday through my ovulation period (which I tested for to make sure I was ovulating) and also I had lower cramp pain on my 5DPO which I read up on google and is due to implantation pains. I haven’t had an period pains yet which I normally do a few days before my period. So what is going on?? I am confused!