Oo, common yan! Maraming kaibigan ko ang nagsabi na sobrang sakit ng breasts nila especially sa first trimester, parang before period kaya akala nila delayed lang talaga ang regla nila haha, pero mas intense and longer lasting. Ang sa akin, naging sensitive lang, hindi ganitong sakit-sakit, pero bawat mama talaga ang experience. If it's really painful or may unusual changes like discharge or lumps, better check with your OB para sure lang, better safe than sorry pag pregnancy involved, diba?