Thank you all so much for your replies and support. She and I both have boys and this is looking like the first female grandchild on DH's side of the family and I really feel she is trying to rain on my parade.
Lovemy3- thank you so much for showing me your pic and explaining the difference with the lines.
babybleux- you are so right she does need to shut it!! I try to keep the peace and she is a passive aggressive type so I will be the bigger person and just let her go and try not to let it get me down.
Alpha- I didnt even think of how the image would change as the baby grows, thank you for pointing that out.
I guess maybe SIL herself may be experiencing a little GD and thats why she wants to bring me down too. Its such a shame that some women are like this to others. We could be a great support to each other, but I guess thats not going to happen. To be honest I really thought Id have another boy and although I would have been sad not to have daughter I would have been thrilled to have two of a kind and a brother for my DS. But I am going to celebrate my wonderful little girl as much as I like, I cant wait for her!!!! Thanks ladies, you are all fantastic and I LOVE this forum xx