After 11 days in the same room, B-ultrasound has gestational sac, which is consistent with the numbe

Generally pregnant 11 days is not detected gestational sac, so after the same room 11 days do B ultrasound gestational sac in line with menopause days is not right, consider is due to detection errors caused, or is pregnant time wrong; can every week to hospital obstetrics do HCG check, if HCG value exceeds 10ng/ml, can determine pregnancy.