Minor contractions and back pain could i go into labor soon?

I am 39 weeks 2 days pregnant. Earlier I went into L&D because I thought my water broke, it didn't but the monitor showed I was having regular contractions 5 minutes apart but I wasn't feeling them at all. Since I've been home I've had about 4 times where my stomach gets very hard and it hurts all over, also in the last half hour or so I've been getting bad pain in my lower back. These stomach pains aren't anything super intense but they do hurt and they don't feel much like any cramps I've had in the last few weeks. Do you think I could actually be in labor or is my body just getting ready to go into labor within the next few weeks? I am a first time mom by the way and the last time I had a check up I was 1cm dilated and 50 %effaced.