Was on the depo shot since July 2005. Took the last dose in September and haven't had one since then. Had periods from basically dec. I had a period in early feb. but then didn't have one again. March 26th I took a pregnancy test that was negative, started my period the next day that lasted 2 1/2, 3 weeks. Haven't had a period since then. Could I be pregnant? If not what could be causing this?:confused: