Ohhh noo tough one darl... Well is there anyway you can find out and just not tell him? But here were our pro's when we had our bubs...

Don't have to buy all yellow!
Can make it easier to pick out names
Decorate the nursery according to sex
And have time to adjust if you have your heart set on a particular sex

Plus im totally impatient and would NOT have been able to wait LOL