Yeast infection and period

I have a yeast infection and a uti mess with my period and delay it? According to my bc I am suppose to start tomorrow but according to this app it’s in 7 days I just got off my period may 25th and it had started may 21st so it hasn’t been a full month yet and I’ve never had the app and my bc not link up before. I had unprotected sex two weeks ago (may 26th I’m on the combo pill) so if I miss this period I will worry I’m pregnant