Fading Breast Tenderness: 5/6 Weeks

I am about 6 weeks 4 days pregnant. Ever since the mid-5 week range my breast tenderness hasn't been nearly as noticeable. Now, some days they are normal and some they are only slightly sore. This is my 3rd pregnancy after having 2 losses, so I'm anxious about what's going to happen. I had an ultrasound at 5 weeks 6 days and saw a heartbeat (102) but I'm not reassured. Any one experience similar symptom fading and go on to have a healthy pregnancy?