Biasanya breast tenderness in third trimester tu normal jugak sebab hormones lagi naik dan breasts preparing for breastfeeding, tapi sakit sebelah kiri je memang agak unusual, a few of my mum friends pun pernah complain tapi it turned out nak fine je. Kalau sakit tu terus-terusan or ada other symptoms macam discharge, swelling yang weird, or kurang comfortable, better check dengan doctor kang just to be sure, kan, peace of mind je pun. How long dah sakit?