Sayang, dengan perut mengeras, sakit pinggang, dan susah nafas macam tu especially at 39 weeks, please call your doctor or go to the hospital sekarang juga , jangan tunggu lagi. Better safe than sorry, nak? These signs boleh jadi early labour atau benda lain yang perlu doctor check immediately. Don't assume it's just from sitting in the car, kena confirm dengan medical team. Go now, okay?