I didn't read all the way through the thread but have an idea for you!
Congratulations first of all...second for the idea...get your first born a tee that says I'm going to be a big brother. you can have it custom made with a date such as I'm going to be a big brother in may or what have you...
and have him wear it to dinner and see if your hubby notices!
I wish you a happy and healthy 9 mths!