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When I got my first shot, the nurse practitioner told me it was effective immediately. I'd probably use a back-up method for a week though, like they recommend with many other BC methods.
I only gained a little weight on it (10 lbs or so), but I did experience the moods and just a general "not right" feeling. I was on the shot for a year, and it took another year to get my period back. I got pregnant immediately after my period came back though (I don't know if I could've gotten pregnant earlier, as hubby was in Iraq). I personally wouldn't use it again. A lot of people love it, but a lot of people hate it as well. Just thought I'd share my personal experience with it!
If you really don't want to get pregnant, Depo Provera is one of the most effective methods. As other people mentioned, nothing is 100%, but it's really close!
Source(s):
Mommy to a 3 1/2 month old little girl
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- Thanks I also think back-up is good