Having a hard time not being jealous.

My husband and I got married in Septemeber of last year. I want nothing more than to have children with my husband. When we got married i had a really good job and knew we would have no trouble being able to provide for a baby of our own but my husband was not ready. I have since lost my job and have not found anything remotely close to my old job. Now my husband says he is ready to start trying but i dont feel like financially we can give a baby the life we want. A month before we got married my younger sister announced she was pregnant. My niece was born in April. I am sure it just seems like it because I want a baby so bad but every week it seems like someone else is announcing they are pregnant. I love my niece more than anything and I am so happy for all my friends that are pregnant but I am having a really hard time not being jealous. How have other people dealt with this kind of jealously?