What to do?

So im not sure what to do!!!

My Period hasn't come on yet but I'm gone wait a few more days b4 i take a test just to be sure. My bf and i have a son already(he'll be 2 in Aug). But anyways if we are pregnant again I'm sure how to tell him. We had a discussiin last where i said i would to have a girl and his answer was no long story short. It's not that he doesn't want a girl cuz he does and i know it, but he just doesn't think that we're ready for another child.

IDk how I WOULD TELL HIM😔