normal?

Hey ladies, just wondering if it's normal to have symptoms disappear? I'm 8w5d today and I haven't really had many symptoms to begin with. No morning sickness, just nausea throughout the day. But the one symptom I did have was extremely sore breasts. I woke up this morning and they no longer hurt. Is this normal or could this be a sign that something is wrong? I have my first ultrasound on Tuesday and I'm just worrying a little.