Hi Angelica,
This is a bad story but I decided to share.
I was 6 wks and 3 days and my sonogram only showed gestational sac with no heart beat....which meant that I m/c...so I had a dnc scheduled to take it out next week.
I hope your heartbeat will show soon!
Looks like your beta is climbiing and that's a good sign. Check out my sonogram pic that I have posted. I was 6wks (4wks fetal age) at the time. It was hard to see much of anything but the doctor said it was there and we even saw the heartbeat. I read on line that around 5wks the sac is 6mm, maybe you were on the cusp of just starting week 6? do you have another sonogram scheduled? I think the sac is supposed to grow about 1mm a day until week 9.
I hope this helps!
I'm sorry I don't have any answers for you, but just wanted to say that I hope everything works out. This should bump your post back to the top, so hopefully someone else can help. Take care.