jealousy

has anyone on here ever felt super jealous of someone else that just had a baby okay I'm gonna explain how I feel right now back in January my brother in law got his gf mind you he has a son by blood and a daughter that isn't his but he stepped up to be the father figure in her life and this is the daughter by the baby mama of his first born plus he now has a step child which is his new girlfriend's kid and on top of the new baby so that makes four kids right? well anyway they had the baby August first and I'm so jealous that they have a new baby and this is the reason why my husband and his family says it's gonna be me next to get pregnant and everyone has high hopes it's gonna be me next to have a baby and my side of the family is always ask when are we gonna have kids and that we ain't gonna get any younger okay I'm 24 we have tried four years and nothing has happened I'm gonna see my Dr this month to find d out what's wrong with me but my question is that is it okay to be or feel jealous? and if so how do I control my emotions cuz they are staying with me my husband and his parents cuz we live with his parents and plus they don't know how the other kids will react to the new baby