Years back I lost two girls 6 months apart due to Pyometra. My fault. They were so tiny at 6 months I just didn't have the heart to put them under the knife. I cannot stress enough the importance of spaying your girls before their first heat, which is usually at 6 months old.
What a sweet looking little girl,she will bring much belly laughs and lots of love.
Congratulations on your soon to be new baby