Helppp

Around last August I got my very first depo shot all was well but when the three months was over more specifically a day before my appointment the doctor called me and told me my health care was canceled and the only way to get my shot was a 200$ fee. I didn't have the money so I missed my shot. I still haven't gotten it since. It's been two months. I still haven't gotten my peridot I've taken like 6 pregnancy test and they are all negative im just confused on what's going on . I'd go to the doctors but I still haven't received confirmation my health care is back . Can someone just tell me what might be happening