I'm going through this exact situation at the moment too! Last night was hard (new years eve) and I'm sure my friends are suspicious (I refused drinks several times... But I thought that if I accept a glass of wine my friend the host might say "oh so you're not pregnant?" And I'd have to lie)
I don't mind telling people but DH really doesn't want to, so I respect that. I'd feel bad telling lots of friends while our close family still don't know.