Something isn’t normal

Hi, I am usually just one that sits back and reads threads but I thought I need to reach out for advice. My periods have always been hell, I know when it’s coming, I know when I’m on and when I’m coming off. I am TTC and I was due today, my body is bang on or if anything a day early. The lead up to my period I have cramps, feel sick and diarrhoea is like leaving the poop tap on. I have had no usual signs at all. I did 2 tests today and both negative. I have been either ravenously hungry and eating everything in sight or eating just to fulfill my 3 meals a day over the past 2 weeks. I am peeing so much too. I know something is off with my body and pregnancy will be the most plausible. Had anyone else had these issues and still had a positive? I don’t want to count my eggs too soon. Any advice will be a great help?