The reason breasts and/ or nipples are often sore, swollen, or tender during early pregnancy is because ...
Pregnancy Symptoms
Signs of Pregnancy ...
15-20 DPO: Some cramping, some nausea, boobs and nipples still very sore, irritable at times, sleepy at 9pm every night.
Noticing the early signs of pregnancy
Early Signs of Pregnancy
pregnancy symptoms and early signs of pregnancy
are sensitive nipples a sign of pregnancy