How soon did your morning sickness go away?

I have my next ultrasound next Wednesday. I'll be exact 12 weeks. Just a couple of days ago I've felt like my nausea had almost completely disappeared and my breasts seemed to be not as sensitive. I didn't have much nausea or breast sensitivity to begin with, but is this normal since I'm coming up on my 12th week? Or should I be worried. I don't like having to wait another 5 days for my next scan.