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evra patch and unprotected sex

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my gf has been the evra patch for over a year to control her periods. her period was aug 18-21 and started her week 1 patch on the august 21st (friday) as usual.

we had unprotected sex on the 29th (saturday, 1 week later). she took off her patch friday night (28th), but forgot to replace it until after we had sex.

i read that if she does not put the patch as her first change on her first period day, that whole week we would need to use latex.

what are the chances of a pregnancy?
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