One day late AF

Jessica

I took 4 tests 8 DPO, 9 DPO, 10 DPO, 12 DPO and all BFN, not even a VVVFL, now I’m one day late and had cramping night before last that woke me up multiple times so expected a heavy AF yesterday morning and all I’ve had so far was the faintest pink smear yesterday morning and nothing since. I’ve been pretty regular last couple months so I don’t want to buy another test and get my hopes up but could I still be in this?? I am 15 DPO now