Menstrual Cramps?

Hi mommies. I'm 38 weeks and 4 days pregnant. Simula kahapon until today, naninigas tyan ko. Kanina around 7pm sguro, nagstart sumakit puson ko. Parang menstrual cramps. Could this be a sign of labor? Tho wala pa tubig or yung sinasabi nila na mucus plug na lumalabas saken. Any advices? Lalabas na ba si baby? TIA.