Hai! Sakit pinggang tu memang common dalam pregnancy, especially kalau kerja banyak duduk atau berdiri, tapi sebab yours is quite painful sampai susah nak tunduk, better check with your doctor or midwife soonest okay, bisa jadi ada posture issue or something else yang kena address. A few of my mum friends alami the same around first trimester, and most improved dengan physiotherapy or just adjusting how they sit/stand, so don't worry lah tapi jangan tahan-tahan je. In the meantime try to rest more, avoid heavy lifting, and maybe invest in a good pregnancy pillow, it really helps dengan the back support! Let me know what your doc says ya!