Thank you ladies for your advice and opinions, they all do help me greatly. I haven't even had a chance to tell DH yet as he is working with a difficult client today and I really don't want to discuss something like this over the phone. He knows we need to talk about the results tonight but that's about it.

Personally I wish I had just have had a scan and stayed clueless about any risk, but seeing as I can't do that I guess it's down to research and discussion between me DH and my OB. I am tending to think that I would rather see what they say at the 20 week scan and then make a final decision if there is any concerns at that scan. The OB didn't like that option but phooey to him, I think it's the only one I am going to be comfortable with.

Oh well guess I better go do some research so I have some facts I can offer DH tonight. Just once I wish I could do things the easy way.