My ultrasound says 2 weeks, which doesn't match my period (my last per…

My ultrasound says 2 weeks, which doesn't match my period (my last period was on April 27). Also, there is a gestational sac 3 mm, but no yolk sac or embryo. Has anyone else had this? I'm taking Duphaston and Utrogestan vaginally as prescribed, because they said there's a threat of miscarriage. The doctor said to come back in 10 days to have another ultrasound and get an hCG test. I'm worried.