Very low chance: Depo Provera (medroxyprogesterone) is a great choice for bc. Renember, some women have irregular bleeding at first. It's expected. Depo-provera can require up to fourteen days to take effect. This means pregnancy can occur within 14 days of the first Depo-Provera injection. Takes 7 days to take effect if given after the first 4 days of your cycle. It's almost immediate if given on your cycle. Either way, sex 4 wks after is ok.
Answered 2/19/2015
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