Plan B effectiveness

Patient : If I had taken plan b on a Monday and had sex again on Saturday will it neutralize Saturdays sex?
Symptoms:  NA
Doctor :   Hello, A plan -b medication is to be taken within 72 hrs of intercourse but the efficacy is decreased , the later it i s used. The withdrawal bleed should occur within 7 days post intake of pill , if it doesn't then you may check for pregnancy on missed period with a urine pregnancy test. I hope i have answered your query, regards

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