AF due tomorrow 3/13 and have had severe lower back pain for 3 days and terrible gas , is this a sign ?? never had PMS signs like this before

Belinda • 43 👼first time Mumma to Oliver 👶🏻 Born 22/11/18

AF due tomorrow 3/13 and have had severe lower back pain for 3 days and terrible gas , is this a sign ?? never had PMS signs like this before