I have had odd reactions from my mum on all 3 of my pgs. She is supportive but I think she just thought we would wait.
I know with #1 she did say that she thought we were going to wait till we had more money. #2 I can't really remmeber her reaction but I know it wasn't the huge congratulations one would expect. This time round I told her not long after my sister told she was also pg. Again it wasn't the over the moon response I would have thought but I think she was still in shock about my sister.
I don't care though, we are over the moon so thats what counts!