Good luck with your scan! My DH came to our 12 NT scan and it was the most amazing moment I think I have ever experienced. I wasn't at any risk but I thought it would be nice to give me that extra piece of mind that bubs was ok, so we did it and we came out as having a low risk. The blood test is like any other so its not that bad. But Blood tests don't worry me. I don't like the needle but its quick and I know its for a good reason so I toughen up and deal with it. But no one should force you to do it or worse still make you feel bad for choosing not to do it. Its a personal choice, so what ever choice you make feel confident with it and don't worry about what other people say. Your young and healthy by the sounds of it so chances are your bub is perfect anyway!