| Re: could someone answer a question..
Spotting is NOT an indication the shot is not working. Nor is it an indication of pregnancy. If you are worried that you may be pregnant, take a test. The hormones in the shot will not effect pregnancy test results whatsoever, as pregnancy tests look for HCG, and the shot contains only Progesterone.
That said, the shot is not 100% effective, but is close. If you are not over-due for your next shot, and were on your period when you got the shot (or at least abstained from sex for seven days after getting it if you got it after your period ended), then the chances of you getting prengnant are very, very small.
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