4 daughters and pregnant again...

I have 2 girls and my fiance has 2 girls...we are now 10 weeks pregnant and I hope it's a boy but if not I don't know what my man will do...the father of 5 girls I think he may snap, no lack of love once the baby gets here but I think he may lose it a little. Should I have him there for the gender ultrasound? Or should I protect him a little and my feelings?