I just started the birth control pill I'm on my second pack today . And I believe that the depo shot hasn't where Off . Since I didn't go in for march and had a continuous period but it eventually stopped when taking medicines that my gynecologist Prescribed And then it seems the birth control pills work . I started my period on the 4th placebo pill I'm on 21-7 pack thanks I'm curious and really wondering when too be aware too call my doctor if any prolong bleeding