I got the shot on Aug. 20th I waited a week like they told me before me and my bf stopped using the withdraw method. The last week or so I've been feeling like I'm pregnant. (I already have a 2 year old son). I have been going to the bathroom a lot, getting bad mood swings and cravings, bloating and really bad nausea. I normally would have already started my period but haven't bled a drop. I've never been on the shot before could I be pregnant or is this just some side effects of the shot?????