Ultrasound showed g-sac no embryo/heartbeat doctor said i was 6 weeks 0 days&hcg levels r 1600. is it normal not 2 see embryo or yolk sac this early?

No,but possible: HCG levels have helped over the years to distinguish between normal and abnormal pregnancies. A transvaginal ultrasound performed on a patient who has an hcg level between 1500-2000mIu will probably see a normal pregnancy .However,there are exceptions(i.e.twin pregnancies,ectopic pregnancies,heterotropic pregnancies ) which can confuse the picture.Repeat ultrasound in one week may clear this up