Why am I not having many symptoms?

Whitney
I am 5 weeks 4 days and I'm nervous bc I'm not having many symptoms. When I first found I was pregnant last week I had some acne on my chest and chin. I got a new facial toner and the acne has almost gone away but I'm still getting a couple little spots on my chest. 
My only real symptom is that my breasts are sore. I can hardly hug someone or lay on them. No morning sickness or any other symptoms. Is this normal? I think I'm going to try to have an ultrasound early to hear the heartbeat. 
This is my first pregnancy.