Jealousy?

My partner and I have been TTC for about eight months. I am really struggling with feelings of jealousy when it comes to my friends getting pregnant/having their babies. I am happy for them, but it is tampered by wishing it were me. I don’t like it, this feeling of jealousy. It makes me feel gross and ashamed of myself because I should be feeling nothing but joy for my friends. If you have struggled with this, I would love to hear how you dealt. TIA.