once u go to your appointment at 12 weeks, u need to tell them you wish to have you 12 week scan and they will tell you how to go about it. But with this scan, u also need to have the 10 week blood test, so mayb head into you GP, they can organise it for u.

The 12 week scan is usually only done if you are of mature age or there is a chance of down sydrome etc. HTH

remember 12 weeks is a good time for an appointment, most hospitals wont see you till you are almost halfway.