I started spotting according to my calculations at 9 weeks pregnant but when i went to the dr. i was told that i was 6 weeks with a sac and yolk but no heartbeat is my baby growing?

I am going through exactly the same thing, I started spotting and went into the Dr. I am 9 weeks preggy, unless my dates are wrong and the baby only measured 6 weeks 1 day with no heartbeat i have to go back in on friday, i am still spotting has this happened to anyone before what was the outcome?