Father's day surprise!!

So as you guys know it's father's day , me and the loml have a 8 month old baby and I'm almost 8 weeks pregnant and he doesn't know yet, I wasn't going to tell him until the 30th after my first screening for baby and stuff . But I was thinking of getting him a card and writing some stuff then ending it with " your the best daddy ever love (son's name), baby h (new baby) and me " with a pregnancy test attached or is it too much?