I had sex a day before my ovulation and i took postinor 2 the next day. will i still get pregnant?

"Postinor 2" is similar to an oral bcp in constituency, and may prevent implantation of a fertilized egg, but is far from 100% certain to prevent pregnancy. If your menstruation is delayed, a "home" pregnancy test is accurate, taken just after your next period is due. If results are indefinite, wait a few more days and obtain a serum HCG test, to be certain about pregnancy.