 [ Symptoms ] one depo shot on nov 20 2012 next shot was due feb 20 2013 have not had a period since january i am really worried is it normal i do not think that i am pregnant but i have taken two pregnancy tests both showed up negative i am always moody stressed out and cramp a lot also i am 20 years old i have been on the depo before but it made my period heavy and light for 3 weeks at a time if not longer afterwards it went back to normal  [ Disease ] hi i am no expert but i also chose the shot for my birth control and so have other members of my family it was the same for all of us our period was normal at first then eventually it went away as we kept taking the shot every 3 months i quit taking the shot after 9 months and my period has returned