What a wonderful Sis and sil you are! I remember when we where having issues I wanted people to ask and care but not to try and give me answer. That's for the professionals not for your support system. The best thing you could do is maybe have a chat with her about it. She may shut off completely or maybe even fly off the handle at you for being pg but remember not to take it personally she must be really hurting. She may on the other hand welcome the chat and let you know how you can support her. she may be happy to hear about your pg because although it hurts she's genuinely happy for you. However it goes just listen to her and don't try to offer cliche answers. By the sounds if it you are a very caring and loving person so just be yourself.