How do I be happy for someone?

I want to have a baby very badly, however I haven't been able to concieve yet. My husband is deployed so I won't be having a baby anytime soon. One of my closest friends came over today for lunch and she made a comment. Then I replied as a joke, "Geez, are ya pregnant or something???" She told me she was. I was shocked, surprised, hurt and yet happy for her at the same time. She was able to sense my feelings and things got very uncomfortable for a while. I feel awful but I can't help being jealous and hurt. I am truly happy for her, it's just going to be hard to be with her now while she starts constantly talking about baby this and baby that. I don't want this to come between us so how do I get over my feelings, esp. w/o the support of my husband around. I love her dearly and wish I could just "suck it up and stop being such a baby" about it. I really am happy for her and want to be a good friend but afraid my hurt feelings will always come out....any advice?