I’ve never posted on here so hopefully I’m doing this right.

So Im 20, lost my virginity to my partner a week ago exact. Sex was unprotected. Lost it a day after ending my period. I just got my period I guess, yesterday. I’ve never been irregular with my period. Should I be concerned? Why did I get my period a week after ended my last period cycle if I’ve never been irregular? Does it have to do with loosing my virginity? I did take a plan b pill the day after sex since we were unprotected does that have to do with anything?

I’d appreciate any answers thank uuuu:)))