Need advice!!

My husband and I have been TTC for 5 yrs now. This has been a long and stressful and depressing road for both of us. I try my hardest to stay positive and not let this get me down. But we all know that's way easier said then done. Right! So My best friend is pregnant. The advice I need is how can I deal to deal with my emotions and disappointment without hurting her feelings and without lying to her about how I feel. Cause that is just not an option, she can read me like a book. Has anyone else gonethrough this?