Ooh sayang, ni memang common sangat at 37 weeks, banyak mum friends aku yang experience the same thing, mostly because baby sudah quite low and pressure pada pelvis plus ligaments stretching lah. Sakit pingggang dan area peha boleh jadi dari SPD (symphysis pubis dysfunction) or just normal pregnancy discomfort sebab baby getting heavier, tapi I'd suggest you check with your doctor or midwife to make sure everything okay, especially since you're so close to due date, better safe than sorry! In the meantime, try pelvic support belt (membantu betul), avoid crossing your legs, dan rest lebih banyak kalau boleh. You're in the home stretch, mama, hang in there!