Hai mama! Aku ada few friends yg dulu experience the same, sakit belakang, mild cramps, especially bila bangun pagi tu memang common masa approaching labour, tapi setiap orang lain je timing dia. Since you're almost 37 weeks, these could be signs your body's preparing, tapi sebab ada mild cramps involved, better check with your doctor or midwife cepat-cepat to make sure everything's on track, they can check if anything else happening. In the meantime, rest more, warm compress on the back helps some mums, and jangan stress sangat, you're in the homestretch na!