Some help me Out !!!

Okay So My Periods Are 28days & Only Last For 5 Days according to my App I was Suppose to ovulate a week earlier but I got my Positive opk September 12th and I was suppose to expect my period Sunday the 15th I’ve been having period cramps for like a week now with negative HCG Test ! I’m 6DPO Could this be early pregnancy symptoms 👀‼️ I had Sex Everyday after my Cycle except for 2 Days