Apr 13, - One of the first signs of pregnancy can be changes in the breasts. respond to you being pregnant by changing in preparation for breastfeeding. Your nipples may become larger and darker as your pregnancy progresses. When you're pregnant, your body goes through many changes. These hormones play an important role in readying the breasts for lactation and are responsible They may feel tender and swollen, although these symptoms often dissipate within the first few Your nipples and areola may continue to darken significantly.