New BC is this why I'm so tired? I just started taking the pills before you get the depo shot(like a trail to make sure the side effects are ok). I've been on them about 2 1/2weeks and lately I've been extremely tired all day even when I get enough sleep. Could it be the pills or the amount of stress I'm under? The pills are suppose to make your body think your preggers with symptoms but this is the only one I've noticed.