Me and my fiance discussed something small if we have a boy. I have nobody who is really reliable to throw me one. My first baby shower my mother said she would host it for me then last minute didnt do.anything which left me and my grandmother tryin to throw something together last minute. It was stressful...
You can have as many baby showers as you want, as long as there are people wanting to host them for you.
I think your idea of having a smaller celebration/brunch with smaller gifts is a great idea for a pregnancy after the first.
You do what You want it's your baby and your party personally I would have one for each of my babies ftm btw. But as far as gifts go make a registry so that u don't end up with stuff you can reuse from baby no. 1 :)
I heard you have one for a boy and one for a girl but not everyone goes by that.