AF due tomorrow!

I'm 13 do and AF is due tomorrow :/ but HOPEFULLY this is my month. Last night I had a really bad stomach ache (Woke me up). This morning I had really bad (tmi) diarhhea. I haven't had diarrhea in a long time. Definitely caught me off guard. Now I'm having mild cramps and still a slight stomach ache. Has anyone experienced diarhhea as a very early symptom?