3 weeks late and not pregnant... ?

Janaye
I don't usually post on here, but I figured I would ask you ladies about this. My AF was due Jan 21. Since my first baby, I am pretty regular (30-34 day cycles). Until now. My husband and I have been TTC baby #2 for just over a year. About a week and a half ago, I took a pregnancy test which came out negative. I took another one 4 days ago, which also came out negative. I had light cramping, which I believed was a sign if my AF, but it never came. I haven't had any super stressful or new life events or lifestyle changes... Has anyone gone through this? Could it have been a late ovulation? Missed ovulation? I have never taken an o test before...