Sakit dan mengeras sebelah tu memang common dekat 36 weeks, banyak of my mum friends experience yang sama, usually pasal baby's position atau ligament stretching lah. Tapi since it gets better when you lie down and you're already at 36 weeks, I'd suggest you check with your doctor or midwife soon-soon to make sure everything's okay and to confirm baby's position, just to be safe. Contractions yang actual labour biasanya regular dan semakin kuat, bukan hilang bila baring je. Jangan worry too much, tapi better to get it checked so you're sure!