what the heck is going on?

Christina • Christina 💋
Started AF on the 4th until 15th, then I started OPKs the had spotting on the 18th and AF came again on the 19th, lasted 7 days and today I've had barely anything. None of my OPKs have turned positive or even close to it, what could be going on? I'm usually regular maybe 1-2 days different, I last 5-7 days then it comes again at the same time the next month, I've taken a HPT to ease my mind and it was a definite negative??