Hi Denny - I'm sorry you're sad, but this is completely normal to feel this way. I've had lots of friends/family pop up pregnant and after the initial pain and hurt that comes along with me questioning myself is over, the happiness just naturally consumes me for them. We all know that it is not that person, its just the ache that you have in your heart that won't go away.
Give it time, you'll feel better about things in a bit.