Aduh, sakit tulang belakang tu memang common masa pregnant, especially bila dah 29 weeks macam you ni, tapi kalau sakit sebelah je dan sampai azab nak bangun, better check dengan doctor or midwife you sebab sometimes it can be nerve-related or posture issue yang boleh di-address. A few of my mum friends pernah alami macam tu, and most of them improved dengan prenatal massage, better pillow support, dan proper posture, tapi memang kena tau dulu apa exactly penyebabnya, jadi jangan tahan je.