amy I had bloods taken at 16 weeks but that's because my local nhs don't offer nuchal translucency testing and so test for Downs etc by blood only at 16 weeks. I was worried because its usually very difficult to take my blood because of rubbish veins. but it was actually very straight-forward this time. the midwife said it was because your blood volume increases during pregnancy and so everything was more "plumped up". the midwife got my vein first time!