Jealously

My best friend of 24 years (we met when we were 5) recently found out that she was expecting. It wasn't planned and at first she was unsure she really wanted a child. Me on the other hand suffers from severe PCOS and have been told it'll be almost impossible to have children. She is my best friend and I am happy for her but also very jealous. I've had to stop myself at times with what I say and now I'm in charge of planning a baby shower for her and it breaks my heart. Any suggestions on how to not feel this way, or to at least help with putting on a smile? It bothers me to feel like this. Hopefully y'all understand.