menstrual-like cramps?

Kasey • First child, Henry, born on 10/23/16
I'll be 37 weeks tomorrow and I've been experiencing period-like cramps in my lower abdomen off and on for a few days now. Today I feel a little bit of discomfort in my back. Anyone else feeling this? I had some mucus discharge a few days ago but it was yellowish-white, no blood in it.