Don't worry TaNasha - I would never have heard of it had it not been for BnB. I think in the US everyone has the smaller one, whereas in the UK only those with the risk-factors get sent for it.
Got a scan today..one of my check-ups through my consultant care. Am very excited but quite nervous. Worried she's going to be small, or as they only got half the measurements at my 20 weeks and was never actually given an okay on her, that they'll find something today.