Hi there! When I saw that you had posted, I got real excited. I expected the first words in your message to be "Gia had the baby!!" Sorry, but reading about Davis first was a bit disappointing, LOL.
I don't think you need to pressure yourself to say the words to Eric. I think he is "getting it" via all the other things - your physical expressions of affection, the ways you help out, all that stuff. I have a feeling the words will just bubble out of you when the time is right and you won't even have thought about it in advance. So, give yourself a break. It sounds like things are going well for you -- don't go looking for a problem, now!
Congratulations on little Bee!