Help me Please advice all welcome

I had my 10 w scan yesterday as I thought but my dating scan only measures 6weeks no HB and the sac is bigger for 10 w. Either I'm going to MC or my dates are incorrect this is what he told me..... I have NOT Stopped Crying since lunch Yest when we were told this news. Thought I have had NO cramps, NO spotting, NO bleeding please help!