I just wanna cry

I know by all means I should be happy for my husband's cousin she just found out she's having her second child mind you she can't even take care of her first she's homeless not married doesn't want to get married and didn't even want a second child and she's pregnant! I mean I tell her congratulations cause I would never want to make her feel like shit over my own selfish feelings. I have had 4 miscarriages my whole life I have a beautiful little girl but conceiving a second is damn near impossible. I should be so happy for this girl but really it pissed me off and it makes me cry.