Missed period, negative tests

My husband and I have been ttc "officially" since since August, but I've been off birth control for 3 years. In January I finally went to the Dr for some out of this world period pain (think 10/10, can't breathe/ blackout, miss work every month). Only suggestion was a higher dose NASID and an ultrasound (which was not abnormal, so sorry! Can't do anything!)

The last couple months I was 'early' by a few days. This month.... Nothing. No PMS symptoms, no cramping, no period. Nada. And the three tests I've taken have all been negative.

With COVID19, my stress levels have seemed manageable, but I'm certain my anxiety about it all is through the roof.

In the past, my internalized stress/ anxiety would lead to neusea/ vomiting, but never a missed period.

Any ideas? Is it just stress? Do I retest again in a few days (10 days late at that time)? Will Glow know how to predict the next cycle? I'm totally lost here.