Sayang, rasa macam tu memang common dalam trimester ketiga sebab baby semakin besar dan pressure kat pelvis/ligament, tapi sakit perut kadang-kadang tu kena monitor lah, especially kalau makin teruk atau ada spotting. A few of my mum friends rasa stretching pain macam tu around 29-30 weeks, tapi better safe than sorry lah, so do check with your gynae just in case, okay? Take it easy, rest more, and jangan takut nak call doc kalau worry. You're doing great, mama!