What are the chances of getting pregnant 7 days after taking the pill?

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Ok, So i was a dumbass i’ll admit it and didnt use a condom while having sex. My girlfriend has been on the pill for a week and a day now and i also pulled i know that doesnt help much but just throwing that in there. Ive seen many different answers saying that BC is effective after 7 days and 30 days which one is right? and what are the chances of my girlfriend getting pregnant? High, Med, Low, Very low?

Low. my girlfriend took the morning after pill 6 days after. she was showing signs of pregnancy until, well…she got her period. she got a EPT test and it came up negative.