I had postinor 2 in january,february and march. i tried conceiving in april but my menses just checked in?

Doses of hormones: One should stop using emergency contraception (big doses of hormones) so often, and instead use reliable ongoing non-emergency contraception... such as an IUD, birth control pills, contraceptive implant, condoms, etc. Postinor and other emergency contraceptives work most of the time but not all of the time. They are only for emergencies, meaning once, twice, or three times in an entire lifetime.