First transvaginal scan of uncertain viability

Is it concerning to see gestational sac with decidual sign but no fetal pole and yolk sac? The size suggests 5 weeks. Doctor suggested possibility of early scan or anembryonic pregnancy given im supposed to be 10 weeks based on LMP. 2 weeks wait for next scan is agonizing. Update: we saw the fetal pole and a flickering heartbeat :) painful 2 weeks but probably more uncertainties to come in this journey.