hi just wondering if anyone out there has had this problem had scan last week and it should of shown I was 5/4 but Only measured 4/3 and no yolk in sac so had to go back a week later been back today and still no yoke in sac but sac has grown from 5mm to 7 mm and showing about 5/5 weeks having hcg levels took again on sat to see if increased has any one experience this .