Bitterness?

For the past year I've caught the baby fever. I've told my husband, he knows, but he's still in school with one semester left. I honestly don't know he's ready to start a family?. These past few weeks my facebook feed has been flooded with pregnancy announcements, I can't help but feel a little pissed off and bitter that these people get to have the one thing that I want the most in life. These people get to become a Mom. Has anyone else experienced this and how do I get past it?