What could be causing my missed period?

Please help 😭😭

I’ve completely missed my period now. I was thrilled at first because I’ve been TTC for 2 months now, but even now all the tests are negative.

A lot of people have told me that maybe my hcg levels are just too low if I ovulated late, but the thing is, buddy and I only got to BD up to 2 days before my predicted ovulation before he had to leave town for work - meaning that if I O’d late im DEFINITELY not pregnant. I was pretty stressed for a week or so following the predicted ovulation so I thought maybe that delayed my period, but I’ve been completely relaxed for a week now and not even PMS symptoms other than being emotional at times.

I’ve had mild right pelvic pain for two weeks now, and I feel like the pain and the missed period are connected somehow, but I’m out of ideas as to what could be going on.