Can someone help me???

Nyomi
So i was suppose to start my period on the 24th but im a day late. But here is the catch on the 20th my fiance and i had sex and i had started bleeding like i was having my period early but it only lasted for 30 mins and i havent seen blood since! Im very confused why im not having my period....can sex delay me from having my period or even stop it completely????