Just need to vent😪

The one person I did not want to get pregnant before I could is pregnant again. I don't get mad or jealous when someone is pregnant, I'm usually genuinely happy for them but this person is a shit mother. She's my SO's sister and we almost had to take her son a few months ago (who will be one soon) because she relapsed on meth and got arrested. I am so heartbroken right now. It's just not fair. We haven't been trying long, we're at the beginning of cycle 3 but I just want to cry and tell her about herself.