ultra sound no sac

manjusha

hi ....i am 6 weeks .went to hospital for general check up .y hcg was 3000 nut doc could nt see anything in my uterus (btw it is abdominal ultra.)they told me to come tomorrow for tv ( trans veginal) my question is at 3000 abdominal us can detect the sac ????? i am scared of ectopic.pls reply