Sayang, backache boleh jadi normal in early pregnancy sebab hormones dah mula relax your ligaments, tapi sakit yang amat sampai susah nak bangun at 4 months is worth checking with your doctor just to be safe, better to rule out anything else la. A few of us dari mum group experience backache early on, tapi level severity berbeza-beza depending on posture, weight gain, and how your body's changing, so it's really best to get it checked out rather than worry, kan?