Okay ladies

My period came early last cycle , I had sex what was 2-3 days before my predicted ovulation for the early cycle and 4 days before ovulation and the day after ovulation that the app gave me . AF is due today , based off of my regular 27 day cycle and no sign of AF, the app says I start tomorrow but a few days ago said I start today. I’m confused and dont want to get my hopes up