What do you say?

We kept this pregnancy among close friends and family until 20 weeks, so most of our acquaintences are just figuring out we're expecting. Which means we are bombarded with congratulations. I struggle with being the center of attention (I like it, I just don't know how to respond) when we are talking about me. I can give speeches and debate, no problem; but to talk about me leaves me feeling awkward. I was married to a man who only ever talked about himself and it messed with my head in the conversation department. Now I'm happily married to a quiet husband who doesn't say much either. It works for us because we both get turns to talk. But it means neither one of us is used to all eyes on us.

Don't mind that this is a totally awkward thing to ask, but what are you supposed to say after being congratulated? Besides "thanks, we're excited." They don't care that we have been trying for this baby for a LONG time. Or that we are still mortified that we might lose her, too. I know they don't want the whole story. But what DO I say to start a normal conversation without choking? What do you guys say when you are talking with acquaintences? How much do you really talk about yourself and this baby? Because it's kinda hard to talk about myself, and yet that's kind of what everyone seems to want to discuss.