Just need to vent

Cynthia • 20, engaged and ttc.
My fiance and I have been wanting a baby for a year. I got off depo shot match 17th of last year didn't even have a period for 8 months after that. My fiances sister got pregnant before me by accident. We found out by hearing her balling her eyes out on the bathroom floor so we walked on and seen the test. She just kept saying her life was over. And wanted an abortion. Well guess she decided to stay with the supposed baby daddy and keep the baby. Her baby daddy is a piece of crap who does nothing but treats her like crap. In return , she cheats on him and come to find out wanted the abortion because she didn't know who's baby it was and wanted to be with this other guy. Well now she has had this entirely new guy all cuddled up in her bed with her who no one knows. Don't know why any of that matters really. It just bothers me. Well I found out I was pregnant a month after she did. I was totally and completely excited and couldn't wait to go to my first ultra sound. Well I lost the baby. And I would never ever wish someone losing their baby on them, but really why did I have to lose my baby which I wanted so desperately. And someone who doesn't even really want it got to keep hers ? She finds out what she's having in less than a month. It's just totally and completely frustrating to be around her knowing she has a precious healthy baby in her and I have nothing.