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I finished period on the 18th,had unprotected sex on 22nd, took postinor2 less than 48hrs, started seeing bleeding like a normal period 5 days after and it lasted for about 4days,now my normal period is supposed to be 18th and has passed I haven't seen, what could be wrong? And when am I expected to see it knowing the postinor I took last month might have caused the delay