Wajar je, sayang! Hormones tengah naik-naik, so the breast tissue expand dan become super sensitive, a few of my mum friends complained about the same thing in early pregnancy. Biasanya settle down sikit after first trimester, tapi kalau rasa sakit sangat or ada other symptoms, better check with your doctor or midwife to make sure everything okay lang. In the meantime, try pakai soft bras that don't squeeze, and avoid anything yang friction-y on the area. You're doing fine!