Uh oh

So the glow period tracker said I was going to start my period last week, but I didn't and I know sometimes the body changes and that the tracker isn't always accurate, but I'm actually starting to be a little nervous because my boyfriend and I are on the verge of breaking up and I can't help but to stress out over the fact that I haven't stared yet. I have taken two tests and they both were negative. Should I wait to take more tests this week?