Thanks for everyones help and opinions. I'm in a very low risk category for NT and like I said, have already had 3 scans. We've decided against the NT scan but at my next appt, I'm going to ask for a quick peek to check on hb. I think that the less scans or intensity of scans the better. If they were to find a medical reason as to why I need more scans then I will take my docs word for it and do them. But at the moment, any more scans that I have will be purely for curiositys sake.
Thanks again and H&H pregnancies and births to us all