My last per was last month on friday the 13 my cycle length is 30 . . . ihad unprotected sex the next day iovulated is pregnancy possible ?

Yes: If you had unprotected sex the day after you ovulated you certainly would be at risk to get pregnant.

Fertiltiy Window: Having sex around the time you are ovulating without using some protection is a sure shot way of getting pregnant. If you aren't trying to conceive, then you can use Plan B within the window outlined. If you are trying to get pregnant, you can check with the upt before your next period to confirm.