In order to get pregnant though, you need to not only be ovulating but you also need to be producing fertile cervical mucous
and a thick uterine lining after you ovulate. The reason
Depo-
Provera is so long lasting is because of the way it works. The levels of DMPA (the synthetic hormone in Depo-Provera) gradually increase over a three week period, at which time they reach their peak levels. After three weeks the DMPA levels begin to decrease exponentially.