Labor... or just pain

Regs

I've tried Google, but it's all like "labor feels different for everyone" without actually listing all the different ways it can feel.

So at the moment, I've had a pretty normal day just regular housework, nothing too strenuous, and now I'm having pretty harsh pain. It pretty much feels like I have my period, like crampy aching that doesnt go away in my lower back and pelvis.

I've also had wet underwear from what I assumed was discharge but I havent really had discharge this whole pregnancy so it's something new.

Just wondering if this kind of neverending period pain is normal for no reason or if it could be a labor sign? I'm 36+2 and have had a completely textbook pregnancy until now