Sounds like food poisoning
I had this at the start of my pregnancy, it settled for me after a few days before the “morning sickness” (which I tell you, for me lasted every day all day until my baby was born) kicked in. Try and keep your fluids up, as it can be quite exhausting x
This is normal. Your hormones are changing and that’s why this can happen. It happened to me and then I was constipated in my 2nd and 3rd trimester. It sucks I know. See a doctor if you get haemorrhoids (happened to me even with the watery diarrhea because of how often it was happening).
Aww dont worry, the cramps are probably from the diarrhea
Honestly… it could just be IBS 🤣 but maybe phone your doctor to reassure you about baby x