Symptoms that went away?everything okay?

Do any of you have experience with having full blown symptoms. Morning sickness, fatigue, swollen sore breasts and then they went away almost completely? I’m 6+5 and have noticed over the past two days that my breasts have returned to normal size and no longer sore and my all day sickness has gone away. We went at 6 weeks exactly for an ultrasound and saw a heart beat she said everything looked normal but now I can’t help but worry. I did call the nurse at the office and explained it to her and she didn’t say that we need to come in or anything but I’m just real worried with having a miscarriage in the past 😞