Had unprotected sex on 10thfeb,took postinar2 on 11thfeb got my menses on 19thfeb then had sex on 25th took postinar2 on 26 but no menses yet,am i ok?

Maybe not: Why twice in 1 month? Emergency contraception (like Postinor 2 or Plan B) is for use in the rare instances of emergencies, not for use as a routine contraceptive. They are for emergencies, meaning they should be needed only 1, 2, or 3 times in an entire lifetime. If not wanting to get pregnant, and if having sex, always have a good primary contraceptive method (a Plan A) in place.