morning after pill is most effective taken ASAP. it's effective for up to 72 hours following unprotected sex, but it's most effective taken w/in 12 hours.
it works by preventing implantation -- it IS NOT an abortion pill. it's pretty much an excessive hormone dose, the equivalent of taking two high-dose birth control pills at once, then another twelve hours later.
it can make you sick and feel pretty brutal, but if you're trying to avoid pregnancy, it's cheaper and less unpleasant than abortion. it's not a good method of birth control, so use condoms or other contraception.
essentially, morning after pill is more expensive and more unpleasant than reliable, regular contraception, so be smart.
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