Thanks for your query. The real situation could be a DELAYED CONCEPTION. As the gestational sac
has got a Yolk sac
, I feel you should wait for another 2 weeks for the fetal nodule to develop. Just be relaxed, and continue the tab prescribed.
I hope this information has been both informative and helpful for you. In case of any doubt, I will be available for follow ups.
Wish you good health.