Congatulations!

No help on hiding it here I'm afraid - both times I was really sick by the sixth week and it was impossible to pretend I wasn't.
I'm also a pretty big social drinker (always have a beer at family getogethers etc) so the second I was off the beer it was like I had a "PREGNANT" neon sign above my head.

If you don't get sick though it would probably be alot easier to cover up I'd imagine.