Normally makikita na ng doctor around 18-20 weeks sa ultrasound, pero may clinics din na pwedeng mag-NIPT test earlier if gusto mo talaga malaman agad! A few of us moms did the blood test around 10 weeks kasi excited lang talaga, hehe, mas accurate pa siya kaysa ultrasound actually, pero mas mahal. Your OB will know best kung ano ang best option for you at your baby!