I am 16 Years old. A while back ago i noticed that i was like 2 to 3 months late on my period, and the only symptoms that I was having was, i was feeling a bit nausious. Not to the point where i would actually throw up, but deffinantly was feeling sick to my stomache! Then one morning I woke up and went to the bathroom, and a dark reddish brown clot looking thing came out. I assumed this was a miscarriage, because I have never been pregnant before. So that same week, i went and got on the depo shot. I know that one of the main side effect of depo is weight gain, but since ive been on depo i have gained almost 20 lbs. I got on in March of 2010 and weighed 120lbs, now in Dec. 2010 I weigh almost 140 lbs. My stomache has gotten way bigger, it used to be flat. Its not fatty looking, but its shape looks almost as if Im pregnant. I still feel that same nausious feeling every morning, until about 1 or 2 o'clock. Now this strage thing has happened. One day, out of nowhere, my tail bone started hurting severely. To the point where i can barely sit for long periods of time in school, it hurts to lay down, and the worst is when i try to move around in bed!! I just would like to know if anyone might know what all this could be??