please help?

I had sex for the first time in 22.nd September. we used protection but his dick tip was on my clit and bit lower. I'm scared that he might had precum on it...im 2 days late but it's only day 27.th atm and my period usually comes around 23rd-30.th day

also I'm sick and really stressed atm because of school so maybe it's just stress or my period is gonna come bit later