Wheres my period? havnt seen it since june 7th?

so my last period was june 7th and i havent gotten it yet. well today i went to universal studios and got on alot of rides. when i went to the restroom after one ride i noticed i was spotting a little o.ly when i wiped though. so now i have no more spotting and now i have diarreah and with cramps... what do you think this sounds like to u?