Is this a sign of labor?

I’m a FTM, 38+3 today. The past few days I’ve felt extremely tired, kind of hot, and very emotional. I had a burst of energy Saturday & since then I feel extremely tired.

I have what it feels like as period cramps. Like my lower back & lower pelvis region where I usually get cramps, is crampy. The only thing though is there’s no “ pattern”. It’s just random & lasts sometimes like 20-30 min of this dull ache & then goes away. I’ve had this for days but it’s gotten a bit more intense today, but I can still talk walk etc.

Earlier I also noticed my underwear were more wet than usual, like they were wet. However there was no trickle/gush. Baby was also moving a lot today. I just feel off, but don’t know if this is normal end of pregnancy stuff. I’ve struggled with really bad period cramps my entire life & worried that I won’t know if I’m in labor or not. Is this a sign of labor?