What do you say...?

For the first time yesterday, someone I just met asked me if I was pregnant. Yea! I guess I'm finally showing. But her first question was, is this your first? What do you say to this? It's the first time I've gotten this far? Yes, it’s my first? No, I had two miscarriages? Saying it's my first seems wrong but why do I want to discuss my miscarriages with complete strangers? What's the proper protocol here? Any suggestions?