By all means, bring Junior along. We'll have an area set aside for the children (with supervision, of course) so you and Zach can enjoy yourselves.
Don't worry about bringing a gift. I asked Regulus, and he said they don't really need anything; they just want to share the day with their friends and family.
I'm just fine; Ethelenda's tea has helped me stave off morning sickness this time around too, and Healer Abramowitz says the baby is doing well. The good thing about living in a communal household with plenty of uncles and nannies is that there is always a pair of hands available, so I don't need any help, but company is always welcome.