When can you see a sac in your uterus? how high does your hgc have to be?

U/S~5wks; bHCG 1500+: The gestational sac (gs) is the first sign of early pregnancy on ultrasound and can sometimes be seen as early as 4 weeks gestation when performed transvaginally, depending on the uterus' position and the sonographer's skill. More commonly the yolk sac is first visualized around 5 weeks. A b-hcg level of 1500 is considered the minimal level when the gs can be seen by transvaginal ultrasound.