WHEN DOES YOUR PERIOD COME??

My period is pretty predictable I would say! My boyfriend and I always use condoms & I never even let him go inside of the condom to do anything so I know there is no way I am pregnant. But how can you tell when you guys are due for your period, as in what time of day? According to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> and another app called Clue I am due for today but its only 2:11 AM right now. So just wonderinf what time of day does your period come ladys?