hi alex,i had my daughter nearly nineteen months ago and during childbirth i had extremely severe back pain. since her birth i`ve had the contraceptive needle every 3 months which has stopped my periods all together, recently i have let the needle lapse and have gotten my period back, which i got the same severe lower back pain again. the two questions i have is how long does it usually take to become pregnant after going off the needle contraceptive and could i have a back problem that occurred during labour? thanks