Help needed

Judith

Hi my last period was 19 of may which I should be 11 weeks pregnant but I was sent to a& e last night bleeding and today they did scan and seen sac and they said it 6 weeks but no sign of baby at all and they did blood test and has any body else had this and been ok as I never had a miscarriage before so scared as they asked me to go back on Monday for blood levels test to see if everything is well