I had unprotected sex on friday night i don't ovulate until tuesday could i still get pregnant?

Definitely possible: While you may ovulate approximately at the same time monthly, even the most regular woman can have some variability in ovulation. Sperm can still be able to fertilize an egg 3 days after intercourse; so this timing is too close for comfort. You are still in the window for Plan B if you want to decrease the risk of unintended pregnancy.