I'm so sorry for your loss hun, its so hard to go through the loss of any baby no matter how small.
I had a MMC in March last year, I found out at my 12 week scan that my baby had died at 11 weeks. I too was so scared that I would never be able to have a baby and because my body hadnt recognised what had happened I lost complete trust in my own body!! I opted for taking the tablets to induce miscarriage, which actually resulted in 5 weeks of bleeding, retained tissue and some strong antibiotics which just seemed to prolong the grief!! But once everything was resolved, we TTC for 2 months before getting this BFP for our rainbow who I am awaiting the arrival of any week now!
Hold onto hope, having one successful pregnancy is a very good sign, and you will get your beautiful rainbow.