Beth - that's great that it all worked out for the best. Double congratulations to you on the new job AND the pregnancy!! A new job is a fabulous way to make your pregnancy fly by.
It must be strange to have told them but not your own family!! I think you did the right thing - imagine how you would feel now if you hadn't told them - it would always be at the back of your mind making you feel guilty.
I recommended a friend for a job with my company and she was offered the job based on my recommendation. Then the weekend before she was due to start, she told me she was a couple of months pregnant but wasn't planning on telling the company. It put me in a really really difficult position and I wish she had just been honest with them upfront. I don't think it was fair to treat the company like that.