7th week no nausea

I'm 7 weeks and 5 days (measuring 7 weeks and 1 day) and the only symptom I have is sore breasts (mainly in the morning) and fatigue. I know every pregnancy is different, but it worries me. I had an ultrasound today and the baby had a HB of 140.. which is also good, but I'm just so nervous something is going to happen.