so I have no idea what a contraction feels like. but since last night I've been having period like…

so I have no idea what a contraction feels like. but since last night I've been having period like cramping and back pain and leg cramps. I drink plenty of water. the cramps would wake me up out of my sleep then go away enough for me to fall back asleep then come back and wake me up. ..not sure if they are just growing pains or something more serious...