TTC . how long does it take for the depo shot to leave your body ?

ttc #1 . was on the shot for 6-7 yrs , stopped in january of 2015 been bleeding (some heavy some light) since . went to my ob she put me on the pills to help regulate my cycle (was on for a month) but im ttc not slow the process down . what should i do 😩😢 ?