I'm falling apart

So Sunday would be my due date if I wouldn't have miscarried my baby in july. Last week I found out a friend/neighbor is 7 weeks pregnant. Today she showed me a ultrasound picture. In the beginning i was ok with it but now I can't stop crying. I truly believe i will never get pregnant again. I'm 36 been pregnant 3 times and have an amazing almost 18 y/o daughter. She lives with her dad in Alaska. We don't talk much. I have never had a good paying job so she thinks she had a bad life. I'm happily married now and my husband doesn't have any children and really wants at least one. I'm so about to give up on life. I'm terribly depressed and don't know what to do.