Salam! Sayang, tengah 37 weeks mcm tu dengan sakit belakang dan leher yang tegang, you really should see your doctor or go to the clinic soon, bukan main-main tau, especially with the tension going up to your neck. Boleh jadi something related to pregnancy positioning or muscle strain, tapi doctor kena check properly to make sure everything okay dengan baby dan your body. A few of my mum friends had similar things towards the end, and some needed physio adjustments or reassurance from the doc, so don't tahan je! Get yourself checked asap, okay?