No change in breasts

Helen • I am 29 years old. Married to a wonderful man who works hard and loves his family. We have 2 beautiful boys together. They are 1 and 2 going on 3. Looking forward to our growing family!
So I'm 7 weeks pregnant with my 3rd. My breasts have not changed, or grown. They are not even sore. Does anyone know if this is normal? Is just early and I'm forgetting when they changed with my other 2? Just seems odd. What do you think?