Spotting 7dpo to 9dpo

Shelle • Ttc#3
AF is supposed to be due on 25/3 I started spotting on Wednesday just two wipes of red blood rest was pink and brown. Nothing made it to panty liner I have took 3 tests since bfn  I don't know whether to accept this as AF and move on to next cycle or keep hoping for a bfp. My periods are normally very heavy. Stressing out! Has anybody had this before. Thanks