confused

We been trying to get pregnant for the past eight months and no luck and I'm starting to think I can't because I lost four babies after my son birth all I think about is wanting to expand my family and I can't I'm sad and angry all the time I even put off my engagement because I'm not happy anymore I'm just so confused is this even ment to be am I not worthy of being someone wife and mother again son many things run around in my mine😶