Sadness

My husband and I have been trying to get pregnant again since we lost our baby 3 years ago. I'm kinda sad that it hasn't happened yet and I think it's getting to him a little also. Everyone around me is pregnant and/or just having their baby and im happy for them but o can't help to become sad at the same time. I feel bad for being sad I feel like I'm being jealous. Is that jealousy or just normal human emotions.