Mama, ito na talaga, go to the hospital or call your OB right now, hindi na dapat maghintay ng RT-PCR result. Ang regular contractions every 10 mins, ang sakit sa puson at likod, at yung discharge, these signs need to be checked immediately, hindi pwedeng maghintay pa ng gabi. You're at 38 weeks + already, kaya possible na talaga ang labor, pero need ng doctor to confirm at monitor baby agad. Please don't delay, buntis ka pa lang, safety first. Drive safe or tumawag ng ambulance kung kailangan!