Help mummies! Is this a miscarriage?

Tested pregnant on clear blue with 3+ on the 11 Nov. (Should be my 5/6 week now) Went for a transv scan yesterday and doc only found a yolk but no sign of baby/heartbeat. was asked to come back in another weeks time for another scan… is it a miscarriage or could it be that it’s too early? Any similar encounter to share? #firsttimemom #advicepls