Hi, once you stop taking almost any kind of birth control you can get pregnant, it all depends on your monthly cycle but you can get pregnant fastbnow that you stoped taking your pill, hope this helps I have been taking a 10 day course of 10mg generic provera off and one for about 6 months now. My OB/GYN put me on it to help force periods. They& 39;ve always been irregular and have had as long as 5 months in between periods. How soon can you tell if you are pregnant? This guide to the 13 earliest signs and symptoms of pregnancy will help you know for sure, plus get info on the best early detection pregnancy tests, how to test properly and what to do in different scenarios. How to use Provera. Read the Patient Information Leaflet provided by your pharmacist before you start using this drug and each time you get a refill. Yes, but again – it’s highly unlikely. Depo-Provera is a powerful form of birth control, and it’s highly effective. There is still a 1% chance that you could get pregnant, but the odds are against you. The birth control shot is effective at preventing pregnancy. If you remember to get your shots on time, the shot (Depo-Provera) is a very effective birth control method. shouldn't be a problem. be sure your tsh is between 1 and 2. your dr. might say it's normal if it's anywhere under 5 but really for maximum fertility it needs to be under 2. also when you do get pregnant be sure you have your tsh checked every 2 weeks the first couple trimesters. Before taking Depo-Provera, you should tell your doctor about all prescription, non-prescription, illegal, recreational, herbal, nutritional, or dietary drugs you're taking, especially: If you had your shot during the first five days of your period then you have immediate protection from pregnancy. Yes there are medicine and herbal products that can interfere with the effectiveness of Depo-Provera. The best thing to do is take a pregnancy test and/or see your doctor. I was taking Provera and never started my period and come to find out it was because I was pregnant.