Preggers? Need reassuring

Al

I'm on cycle day 64, and my hubby and I had unprotected sex right before my green days on what was supposed to be my first period (so over a month & a half ago) I have taken several Clear Blue tests, past 14dpo, all of which are BFN.

Its been about 3 months without BC, could that be why AF is so late? Usually when I switch or go off of BC it stays normal.

Should I go get a blood test even though my piss tests say BFN? How rare is that?