Pregnant while on the depo shot? ?

Question

I have been taking the Depo shot for almost two years and i've never had a problem with it. Occasionally I spot a little bit (very seldom, probably three time in two years). I was spotting and didn't think anything of it and ended up having s*x. What are the chances I can get pregnant from this?

Answer 1

Probably pretty slim, like .3% to 3%.

Depo-Provera estimated typical use first-year failure rate = 3%

Depo-Provera can affect menstrual bleeding. After a year of use, 55% of women experience amenorrhoea; after 2 years, the rate rises to 68%. In the first months of use "irregular or unpredictable bleeding or spotting, or rarely, heavy or continuous bleeding" was reported.