Period start date

Anyone else get super annoyed when they know their app says that they're supposed to get their period on a certain date (and the app is usually correct), but then they start thinking about it too much and stress themselves out?
I was supposed to get my period two days ago, but here I am stressing and checking all day waiting for it. 
I once worried myself six days late, it was no fun. 
My boyfriend and I recently started beginning sex unprotected and then using a condom halfway through. So even though it's unlikely that I'd get pregnant that way, there's always a chance and that sometimes eats at the back of my brain. Yay anxiety. We're not ttc and I should be getting on the pill very soon. 
But yeah. I'm having pms symptoms (irritability, bloating, minor cramps, headaches) and I'm just stressing myself out. Anyone do the same?