i've been on the implanon birth control since nov 2011 about 2 or 3 weeks ago i was given a cortisone injection on my coccyx and methylprednisolone pills for 6 days to take but now i have been having cravings and my body is telling me im pregnant but i am not sure if i am. is it possible that these medications stopped my birth control from working? i took a h.p.t and the result line came out very faint so i am not sure if it is accurate.any help please.