You have ovulated later that you thought, and that might explain the size difference. When will you have another sono. Maybe the heart rate will pick up by then. Good luck to you.
Thanks for the encouraging words :-)
I'm heading back to the hospital tomorrow for a second ultrasound. I'm hoping that they will find that they picked up my heartbeat the first time around since they were having such a hard time recording it to began with.
Keeping my fingers crossed!
You could have ovulated late, which would explain why you'd only measure 5w6d. Also, the baby could just be smaller than a "normal" baby size. A low heartbeat is NOT always indicative of a miscarriage. At 6w with my daughter, she had a low heartbeat, but it had picked up by the time I went back at 8 weeks. Her heartbeat had been around 90bpm and it picked up to 161 by 8 weeks. She's a happy, healthy 11 month old now.