Confused and scared

Julie
Based on my calculations I should be 8weeks 2 days today. I went in for my ultrasound today with hubby in tow. They did a transvaginal and saw a gestational sac, a yolk sac and fetal pole but no heartbeat!!! Doc said fetal pole measures at 6weeks 1 day. Said it might be just a day too early to hear a heart and to come back in 1 wk. I was so upset that didn't even ask anything. So does that mean I'm only 6 weeks and 1 day preggo instead of 8 like I thought? 
He said next week if there is no heartbeat then it will be deemed a mc. I'm so upset and scared. 
Did anyone have similar experience? Fetal pole but no heartbeat?