i hope the best for you. that happened to me and it's the worst feeling ever. some heartbeats are not heard or seen until the tenth week. i will keep you in my prayers.
I know how you feel when I was pregnant with my son I didn't hear his hb utill 9 wksI!! I have so many u/s and my dr also beleive I had mc. Just hang in there and I hope you finally get to hear it. Like, Tanker Chic said you would have symptoms somekind if you had mc. Best wishes.
Good luck at your appt. I would try not to worry too much. If you were m/c, you would probably have other symptoms.
Think happy baby thoughts!!