If you had a first-trimester test and the ultrasound showed the baby normal - but the blood test showed you have a high trace for Down syndrome - does it mean your baby will be born with Down syndrome?

No. Both the scan and the blood test just give a higher or lower risk of Down's syndrome based on your age. For a diagnosis you will have to have an amniocentesis. You need to talk with your doctor, a counsellor and your partner to work out your next step.