Jealousy

I'm having major jealousy issues with other women getting pregnant around. My husband and I have been trying for almost 3 years after our miscarriage and I get jealous and depressed every time one of my friends pop up pregnant. I've been in the biggest funk ever since my best friend had gotten pregnant...it's frustrating and sad to be in a situation where you should be happy for them but your dying inside wishing it was you.