Need Advice! :)

Okay ladies I need some advice! My best friend (sister-in-law) has a 1yr old little girl (my goddaughter) and she just told me she may be pregnant again. I have been TTC since November and it's something I want more then anything in this world! I obviously want to be happy for her..which I am, just jealous I guess..but it is so hard! I don't want to sound mean, and I would never tell her I'm not happy but..help! Any suggestions on how to handle the situation!? Thanks ladies! :)