Just about every woman has some breast tenderness during early pregnancy. There are hormones at work and the breasts are getting ready to give milk and breastfeed the new baby that will be coming soon from the pregnancy. Be sure to get a good maternity bra, that can help ease the strain on your newly bigger size and more tender breasts. It also helps to sleep with an extra pillow that is really soft, that way you can place it between your breasts and cushion them while you are on your side. Hope that helps :)