I would imagine it's very possible. I bled with all of my children and ended up being 3-4 weeks further along. I assumed more recently I was 4-5 months (if even pregnant) and from my blood test I was determined 8-10 weeks. Just try not to get too excited! The u/s will really help!
I was 10w4d when I first heard the baby's heartbeat at the dr's office (8weeks when I heard it at home with my doppler) and it was very loud, she probably had the volume up pretty loud where it seemed as if it was loud, I wouldn't worry about it to much
I first heard my daughters heartbeat at 8 weeks...the doctor picked up on it as soon as she put the doppler to my stomach and it was very strong and loud....so I wouldn't worry too much if I were you