Am I being pathetic?

My father in law has asked us all to go away on a family holiday in July, me my hubby our little boy, my hubby's brother & his pregnant gf. I know July is away off and I could be pregnant myself by then but I just don't want to be around her....at all. I can't bear it, I can't stand my brother in law mentioning that she is pregnant every 2 minutes and insisting she has the most largest comfortable seat just because she is pregnant - he knows iv suffered multiple mc's and I just feel like he is all really insensitive and doesn't think about how I must be feeling. I wouldn't be so bad if they were a couple who were trying for baby - but they were only together 4 weeks and she announced she was pregnant!! I just feel like it's all a kick in the teeth for me atm & I don't feel like I can face her. Am I being selfish & pathetic? Or do others feel the same? Sorry for the rant lol xx