Help with my period.

I had unprotected sex this Friday, and I'm supposed to have my period yesterday because another app of my period said it. But my glow calendar says that I'm 4 days away from my period. Should I concern? I don't wanna get pregnant but I didn't had the pill. 
By the way, it was sorta my first time with my boyfriend and he didn't came in me or anything, the sex was not longer than 4 minutes bc I couldn't take it.