Is taking postinor after every sex good?

Probably not: Postinor is morning-after pill taken after unprotected intercourse to prevent pregnancy it's intended for emergency contraception, not daily contraception. Use more than once a month can alter menstrual cycle, thickening of the endometrium, possible infertility or ectopic pregnancy. Gyn/fp can offer several options for regular contraception, including bcps, foam & condoms, etc.