faking that congratulations...

My husband and I have wanted kids for a long time, but we decided to wait until we were in a slightly better place financially. So it wasn't until about six months ago that we decided we were going to start trying. And so far, no luck. I know it's early days yet, but on Friday we found out our friends are pregnant. And this would normally be happy, happy news, but all I can feel is depressed. It sucks. And every period is a terribly frustrating reminder that my womb is empty. I just want to be pregnant already. Anyone else finding themselves in a situation like that? How do you keep faith and not let others happy news bring you down?