3+ days late for period

Going on 4 days late for AF. This has never happened to me. I tested a day before it was due, one of my other calendar predicted AF to start Tuesday. The one on eve predicted Thursday. Either way I’ve never been this late. I had unprotected sex with my ex during ovulation. He claims he didn’t cum. I want to test again im just nervous. Should I tell him I’m late or just wait it out and retest.. then only say something if im actually positive. I just feel alone right now I guess.