You have gone through something very traumatizing and your feelings are not irrational. I will simply tell you that you don't have to say anything. In fact, maybe you should tell her that you are still grieving with the loss of your daughter and miscarriages and it is just too hard to hear about her happiness. I have had multiple losses but not a late loss, and can not imagine the pain you are going through. Please, dont feel like you have to go out of your way to congradulate them...they should love you enough to know that probably the last thing you want to hear or talk about is someone else's happy pregnancy.

Feel better....and congrats on the pregnancy