Ultrasound too early?

Stephanie
Hi everyone. I'm a nervous first time mom. Just had an ultrasound yesterday. The dr said I was 7 weeks, counting from the start of my last period, but the ultrasound looked like a 5-6 week scan... (Visible sac and inside it the round yolk sac.) They kinda freaked me out, asking if I've had any bleeding. (Like I've miscarried?!) 
So this morning I did a whole bunch of figuring - I'm an average 30 day cycle, so I know what day I "should" have started my period and didn't (though I had implantation bleeding the 2 days before). Counting back from there using average luteal phase and average days between fertilization and implantation puts baby's conception at most likely Nov. 23....... Making yesterday's ultrasound on Dec. 28 EXACTLY 5 weeks. 
They scheduled me to come back in 1 week. My question is do you think enough will have changed? Or should I call to reschedule in another week? It really broke me up to expect a heartbeat and embryo and not see anything. I don't want to do that again!

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