Being too mean?

My sister in law (my husbands brothers wife) just found out she's pregnant with her 4th child.. My husband and I have been actively ttc for 26 months now. They sometimes stay with us for a weekend at a time. Well they were with us about 5 weeks ago when she found out she was pregnant. She come out the bathroom as shows me.. I was nice but it killed me. Well they are with us now.. And last night she was laying on the couch just rubbing her belly.. I know it's stupid but it really bothered me and I just wanted to cry. Then she starts talking about being nauseus and how much it sucks.. I'm trying to be nice but I just wanna say "I would give anything to be nauseus!" Am I being too crazy?!