AF due 5/14 and didn't show??

yasidi • 21 single mom to a beautiful little girl
AF was supposed to show yesterday. I haven't been experiencing cramps and usually do. I do get tiny cramps but they don't hurt it's like a dull pain. also I've been nauseated and burping a lot of acid. this has never happened before. has this ever happened to anyone else? I've had more symptoms but I don't know if it's AF or pregnancy symptoms help!