Period feeling? 38 weeks

I’m 38 weeks + 5 days. At my doctor appointment Tuesday I was told I’m 70% effaced, baby’s engaged at -2 station, and I’m a fingertip dilated. So I’ve been bouncing away on my yoga ball and walking. Last night I woke up at about 4 and was having some light cramps in my back, and today I feel it again. It reminds me of how I feel when my period is about to start, I always had cramps in my back from it & back discomfort. Is this normal? I wouldn’t say it’s unbearable but it’s not ignorable either, it kinda comes and goes.