How come i have my period on may 14 when my last one was on april 21 and we have unprotected intercourse on may 9. can i still be pregnant after?

Irregular menses yes: Irregular menses are very common in young women. While it's less likely to become pregnant 5 days after your menses, it's not impossible if you engage in unprotected sex. So if you don't want to have a baby, start using some form of birth control. And if you don't want a sexually transmitted disease/infection, make him wrap it up by wearing a condom each & every time.