Period like cramps?

I’ve been experiencing waves of period like cramps in my lower belly & back, I’m not sure what it is. I thought it was cuz I needed to shit but I did earlier & I still feel like this😂 It’s been happening since this AM. I still feel baby moving around, earlier it felt like I wanted to piss myself from his movements. lol

Is this normal? I’m 29 weeks. It only lasts for like a few seconds when they come. It’s so weird.