Beginning signs of labor?

I had to be induced with my first so I never got to experience the whole laboring process.

I am 35 weeks, so still early. I have been having contractions off and on for a few weeks. L&D told me they are real contractions but not making me progress yet which is a good thing. However, today the pain in my back is so strong, my thighs feels crampy and sore, period like cramps and contractions, and something new… belly cramps like I need to poop.

Now, I was just in the hospital for a severe migraine and they treated me with magnesium which I know can help with bowel movements so I’m wondering if that’s where those cramps are coming from.

Should I be keeping a closer eye on all these symptoms?