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I've got a bit of a concern about my period and Plan B. I had my period mid-July, from the 14th to the 18th, and then I had unprotected sex on the 19th. I took the emergency contraception pill on the 22nd. But then, oddly, I got my period again on the 28th, and it only lasted about 4 days. Is this normal? Could this be a side effect of taking Plan B?