3 days late 😯

Okay y’all so I’m 3 days late. I took a test on the day of my missed period and BFN. About 5-8 dpo I experienced mild cramping. The past few days I’ve been emotional and have continued to have mild cramping but my breasts are not sore (usually are) and i have no spotting. (usually that’s how my period starts out) ?? Wouldn’t it have been positive on the day I missed AF? The only thing besides emotions is tiredness and slight lower back pain. Am I out ? Is AF coming? Has anyone experienced this with BFP?