I feel like a bit of an ass but need to vent, so here we go....

My SIL is 21 and has a 2yr old. When she found out I was pregnant in early February she was like OMG I wanna be pregnant too. She just got back with her sons father a few months ago. Well guess who is 6 wks pregnant...she said they told her it looks like it will be a girl. I know they can't tell right now. It's irritating me. I feel like she just got baby fever and she should wait to be more stable...I mean they both just had their cars repoed in the same week! IDK, I'm trying so hard to be happy for them but I'm irritated....woosa. rant over