Hello everyone, 36 weeks of ultrasound, the third day my belly hurts a…

Hello everyone, 36 weeks of ultrasound, the third day my belly hurts and the umbilical cord lets go for a few seconds and then again two or three times, even when I go to the bathroom, the baby seems to help empty it, like he's peeing, started running to the bathroom very often, I'm afraid that soon they might start labor, it's still early, has anyone had this? Maybe you can tell me something.