Conceiving after depo provera

Hello :) could you tell me how much time it took you to conceive after depo provera shot (every 3 months)? My last shot was in october 2014. Then, I took the contraceptive pills... I don't take any contraceptive for more than 50 days. One day I had spotting but nothing else and I'm not pregnant. I know it can be normal but still... I thought that after more than 8 months without depo provera my period cycles would have return to normal for TTC :/