Pms!?

My period was supposed to start 09/08 but did not come although I was cramping yesterday so I’m assuming it’s coming. I have been nauseous for a little less than a week which I thought I knew why but idk now I also been noticing my stomach rumbling like I gotta pass gas or go to the bathroom but I can’t. Before I jump to my last conclusion, could I just be crazy and it’s my period coming and playing tricks? Okay thank you byee 😘