Question about my gestational sac

Hi all today I had my first scan . I'm 6 week and 4 days pregnant. I got a gastational sac with fetus pole in it. Baby heart rate is 163. But they found my gestational sac is slightly low than the normal position and asked me to come back for another scan in two weeks. I don't have any discharge or spotting so far. Doctor suggested me some progesterone tablet to support my pregnancy. My question is anything wrong with the slightly low gestational sac position anybody experienced this ? I'm hoping for positive experiences. Thanks.