I took plan b after sexual intercourse will it still work if i'm ovulating ? if so will my period be late?

Plan B: Plan B is 75% effective if taken within 24 hours and it usually causes some irregular bleeding about a week or so later. Plan B is not a good method of regular birth control. Time to use condoms and get on the pill or something else.

Yes: It should work. Plan B has the same degree of effectiveness at any time during the cycle. It is about 95% effective if taken within 24 hours of unprotected sex.