so last week me and my boyfriend has sex for the first time and we had sex 4 times thoughout that week on different days and we used condoms each time but I haven't got my period yet and according to my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period app</a> I should have started last Thursday. in the past my periods have been quite irregular either a few days up to a week early/ late. I've been quite panicky about it and not sure what to think.