Please Respond!! I need advice!!

Nina • 29, TTC baby #1, madly in love
Glow says my period was due on Thursday, it is now Saturday and AF is not here.  TMI, but we had sex once on Day 1 of my fertile window and a few other times but DH never fully released -- he/we were just too tired.
​I am now experiencing light cramps (no other symptoms), but no bleeding at all. 
​Took pregnancy text on Thursday evening and got BFN.  
​Could I be pregnant?? Thought we were out because we had sex too early before peak O day.