TTC since early Nov, I am 12 DPO and AF and according to app I am due on in 3 days. HOWEVER been getting period pains all week. Rarely get them before and never for a number of days and now feel like I am about to get AF any second keep checking and nothing…:today I put a pad on and just a few streaks of yellow discharge. Still no AF. Tested numerous times and BFN. What is going on 