Hi there. I am 12 weeks pregnant and had my ultrasound NT scan done today, along with blood marker tests. The doctor observed a reversal of the a wave in ductus venosus. NT result is ok at 1.2 mm, all other parameters of the baby are fine. I am now really worried. This is my first pregnancy. Can anybody who had a similar experience, guide me please? I have been called at 16th week for a scan again.