Contractions at night and randomly in day (37+4)

From the day 37 week started, I have been getting more intense and frequent Braxton Hicks. Enough to make me uncomfortable. I drink a lot of water and fluid throughout the day. Now, I have started to get this period type cramp that goes from front to back and a lot of back pain during daytime. Last night, I had a painful period like a cramp that was strong enough to wake me up from deep sleep. Could it be labour approaching? Also a tremendous increase in discharge.