I missed the Depo-Provera provera (medroxyprogesterone) shot. I have been on it for two and a half years. How long is the Depo-Provera good for before getting pregnant.?

3 months. The manufacturer says 3 months. Many women 'may' have protection beyond that, and many women do not resume cycling for several months after getting off dmpa, even up to 2 years! but if you don't want to be pregnant, you better assume it is 'good for' 3 months.
13 weeks since LAST. Many women take their next dose in around 11 weeks to stay protected. If due to any circumstance you do miss a shot or delay till the 13th week, it is advisable to use secondary birth control methods, like a condom or a diaphragm, until you get your next shot. During this time, it is also important for you to check for pregnancy, as receiving Depo Provera (medroxyprogesterone) while pregnant is not advisable.

Related Questions

What r my chances of getting pregnant. A few weeks late for my Depo-Provera provera (medroxyprogesterone) shot?

Possible. But not likely as there still should be enough depo left in your system to prevent pregnancy, but my rule is that you must 1st do a preg test beofoe you get another depo shot since you are late, please see your gyn. Read more...

When having sex on your ovulation day what's the chances of getting pregnant? I'mtrying to conceive I've been off Depo-Provera provera (medroxyprogesterone) since 10/2/12

Ovulation. Each ovulation is an independent event. It is very tough to give a percentage on the chance of getting pregnant. That being said, however, 85 % of couples under the age of 35 having frequent sect will conceive with a year. Read more...

What are the chances of getting pregnant if taking Depo-Provera provera (medroxyprogesterone) & antibotics?

Very low. Depo so effectively shuts down ovulation and makes inside uterine lining unreceptive to implantation of a fertilized egg that only ~1% women get pregnant each year that use it. Read more...