Does it make me a bad person?

So I've just found out through a close friend that another girl who I am also good friends with has announced that she is pregnant and she is claiming that it was an accident and not planned at all. And instead of being the good friend I've always been, I'm instead crying my eyes out and asking why isn't it me?

My husband and I have been trying to conceive for coming up to 20 months. And although I am happy for her, I'm devastated. I just feel so let down by my own body.

Everyone keeps saying that my time will come, but I'm honestly starting to doubt that I'll ever be a mummy :(