Maybe it was something wrong with the baby and that was why you miscarried. I don't know much about the shot's other than they do have some bad side effects after coming off it.
Just stay positive and relax. If something happens you'll have plenty of time then to freak and stress.
I already have a 4 year old son so dont think it anything to do with me unless something has happened I had the depo injection after him hope it not that read sine bad thing about that
Depends on if you have a family history of miscarriages or if it's something wrong with you. Most don't miscarriage again and there could have been something wrong with the baby and that is why you miscarried the first time. Just try not to stress about it which is easier said than done and if you think you are having problems then go to your doctor and just explain to them your fears and let them know you just need reassurance. If by chance this does happen again then I strongly suggest you get checked to see if there is an underlining medical condition causing this. Good Luck!