Late Period

I had sex with a condom on day 22 and 23 of my period. I have a 28 day cycle typically. I believe I ovulated late, so around day 16 (I had peed and there was a slimy discharge). I'm now 2 days late for my period. I've taken 2 pregnancy tests, one yesterday morning and one a week ago and both came negative. I'm having period symptoms, just no sign of period yet. I know stress can cause a late period and I have been very stressed with moving, my relationship, my new job, school starting, not sleeping well, etc... Can anyone give any tips on what I should do? I don't think I'm pregnant, because of the tests...but just need to talk to someone about it!