Wa'alaikumassalam, mama! At 36 weeks 5 days, clear mucus with whitish discharge bisa jadi tanda plug mucus dah mula keluar, tapi bukan semestinya labour coming, sometimes boleh keluar weeks before actual labour, especially kalau baby positioning tengah berubah. Since you mentioned baby gerak tapi less strong than usual, and you're having consistent backache + tightening, best to call your clinic or labour ward sekarang juga to get checked, because they boleh assess your cervix and monitor baby properly, my one mum friend tunggu lama2 thinking it's practice contractions, rupanya cervix dah 4cm! Don't worry, you're close to full-term, so even if labour starts sekarang OK je. Keep track of contractions (if ada) and any bleeding, and go in if contractions jadi regular or if you worried about baby movement.