Never ask someone about a potential future pregnancy.
Don't ask the bride "so when are you going to have kids?" Don't ask them if they've been married for a while, either. Maybe they can't have kids. Maybe they don't want them. Maybe it's not time yet. Maybe they're not financially set up to do it yet. In any case, it's none of your business. None. Zero. Not even amiably conversationally. Don't ask.
By extension, I've got a 17-month-old daughter who is just cute as the dickens and everyone at the office loves her, and that's fine, but when I get asked "So when are you having another one?", it's all I can do to smile slightly and say "Not today."