Hi, my wife is 39 weeks and 4 days pregnant. We are waiting for her labour pain. She is having a kind of pain that occurs only at nights. She felt like a pressure that starts from the lower back and her stomach becomes harder. It comes at random intervals but not during day time. She feel very weak during the pain and the pain sustains for 15 seconds. What should we do? Her due date is on 26th of this month.