Hey, I am just over 8 weeks and barely having any symtoms myself. The sore boobs come & go, but I was expecting morning sickness after what I went through with my DD, so far its a no show. Seeing as you have seen a healthy bubba on the ultrasound, you dont have anything to worry about. As for the heart rate, if there was a problem the sonagrapher would have let you know. All the best!!