low heart rate? 102? :( & RAMZI?!

Em
Hey ladies. I posted a few days ago about our first ultrasound - we were thinking we were 7w3d at the time of the US but we only measured 6w3d (not a big deal....) but I just got a call from the doctors office today and I asked them what the heart rate was and it was only 102 bmp :(
Should I be worried?
Apparently the doctor said everything was fine... but I can't help but worry. 
6w3d and only 102? :(
Let me know your thoughts..
Also, any Ramzi guesses?