Why can't I have a baby too?😢

All of my friends are either pregnant or have really young kids. I'm saddened because I would love to have kids but I just can't. I did get pregnant once before with my husband but I miscarried. That was the only time I've ever been pregnant. And the reason for the miscarriage was because of my work environment (I work in a shop that specializes in diesel cars and trucks).

I obviously went to school for this field, worked hard to be the head transmission tech in my workplace (and the first female at that too!)

I can't just quit to try and have and baby because then how and I going to financially support my baby?

I'm so torn. I love my job. I make good money. And I want to start a family. What do i do? And it doesn't help that all my friends just seem to keep popping out kids like it's nothing and the easiest thing in the world! Maybe God's plan for me doesn't involve me having children.