Periods

currently annoyed with my period. i always get my period a few days after the date thag my apps say it should be on. I'll either get it like between 4-6 or 7 days later sometimes. i always have unprotected sex with my boyfriend & every single time this happens i end up getting my period. but right now idk why im freaking out. I've gotten a ton of acne the days before mt due date. & then they went away. I always have cramps before & some during my period. this time I haven't felt any. no dizzyness or anything either. im chillen lol. but i was supposed to get it the 8th. now its the 14th. when should i be worried?