Wanting to be pregnant and Coworkers abortion

I'm 30 years old and will be married 7 years in August with a soon to be 5 year old who desperately wants a baby brother. I want nothing more then to give her a sibling even if it isn't a boy. I'll be off birth control two years this month and still nothing. My coworker is 20 with a 5 year old a 4 year old and a baby boy who is a little over a year. She just found out she was pregnant and got an abortion because with her deadbeat boyfriend and living off of other people with 3 kids a 4th would just be to much. While I would never in a million years get an abortion I also believe its something you don't understand till you go through it. My problem is mostly I'm angry but not angry. I should be pregnant and yet she got pregnant and didn't keep it.