Feeling heartbroken

I just turned 31 in January & right before my birthday on the 4th my fiancé & I found out I was pregnant the next day I had a miscarriage I am on dialysis & wanted this more than anything, I have a best friend who just found out she was pregnant & a future sister in law who is also expecting I am happy for them but I grieve for myself & am jealous how can I get past this & truly be happy for them I feel like I am being bitter & wish it was me that was over the moon needing support please