I feel defeated

In the process of miscarrying at about 5 and a half weeks pregnant. I feel like it's so unfair to not only have emotional pain but excruciating physical pain. Watching this little life basically drain out of my body and I just want to know why. I also don't know how in the world I will be able to even function when and if I get pregnant again. How will this scenario not consume my thoughts? I trust that God has a plan bigger than what I could imagine but this sucks it just plain sucks.