I'm so tired

I've been having issues with bleeding throughout this whole pregnancy and I'm about to be 19 weeks. It's been a very difficult journey. I've been in and out of the hospital and they always tell me the same thing & diagnose me with "threatened miscarriage". No one ever tells me why I'm bleeding. I'm just blessed my baby's fine. It's just so difficult always being traumatized and being on bed rest all the time. I want to enjoy this pregnancy for once without always being worried.