Does anybody else who's on the shot have like long periods for long periods of time...like I've only had one shot so far and like my cycle (I guess that's what it is) came down and it's been down now for 3weeks, idk if I need to call my health care provider of what but it's still down and everything this scares me because this is my first time ever on birth controls period so I don't know what exactly to do, any ideas???