I need a peace of mind

I lost my virginity earlier this month and we used protection (I’m not on birth control). My period is pretty irregular but I’m expected to start it today actually according to the app. Although it doesn’t always start on the exact days of the app, I usually feel some type of symptoms for my period (slight cramps, backache). Should I be worried or should I just relax and wait a few more days due to my irregularities?