 [ Symptoms ] i stop taking the depo shot three months ago i have been having unprotected sex can i still get pregnant [ Disease ] i am not sure if you are saying your depo shot expired 3 months ago or if the last time you had a booster was 3 months ago if your depo shot expired 3 months ago then you can absolutely get pregnant by unprotected sex the depo shot is not a permanent solution depo provera birth control lasts roughly 14 weeks in a woman is system before being completely ineffective but the shot must be received every 12 weeks to maintain full protection