don't know the gender

Pro: the surprise can be fun.
Con: some people like to buy clothes specifically for the baby, so you're stuck with gender-neutral clothes for the first size. But once the baby is born, you can fix that.
So there aren't really any pros or cons.

I didn't know on purpose with the first one either! It's so nice to find out during the birth!!
I have to say that emotionally I was 99% sure it was a girl and it was

Hi,
I thought until the birth that my daughter was going to be a boy... we didn't know and I didn't mind at all. I'm pregnant again and think I probably won't want to know again. We bought everything in neutral colors for the birth. The birth card and baptism sugar were very colorful though. The birth card was prepared in both boy and girl versions and was fine after the birth. I never regretted not knowing...

With this pregnancy, we know for sure now, already from 14 weeks, and we're having a boy Because we were too curious and wanted something practical for now. Both have their advantages, indeed.