No AF and negative Pregnancytest

Sonia
... It's driving me insane. My AF is overdue since 4 days. I never been late. Usually five days prior I have cramps and my breast hurts... Nothing!!! The last 3 days I had some cramps but they where barely noticeable... I did two pregnancy tests, both are negative.. 
I'm TTC but my husband had a vasectomy reversal done and they told us there was zero spermcount, so I can't even be pregnant ... Did anyone been trough something like this?