when your monthly comes out of nowhere

my periods are incredibly irregular so i never know when they are coming sometimes it will be back to back and some times it will be every 3 months or so but every once in a while ill cry about something silly on tv or get really manic and have to bake and clean all night and ill step back and be like whoa whats wrong with me...then ill go pee and notice that i started and heave a sigh of relief because for a second there i thought i was going soft...