Hi Vino

I agree with Jackie, a hearty "Congratulations" is always perfect when you know the person is happy about the pregnancy. "I'm so happy for you" is also good (if you are).

There are many superstitions surrounding pregnancy so definitely avoid saying "good luck".

"Good luck" is usually used in circumstances where a person's success is not always assured, and that is certainly not what you want to have the pregnant woman worrying about.

"Good lord, I hope the baby doesn't look like his father!" should only be used if you know the person very well and they have a sense of humour.