Period 7 days late with a BFN

Tia

How likely is it I’m still in the running for my BFP? If i properly calculated im about 20 DPO I took a test this morning and it was negative. But still no signs of AF at all. I’m 7 days late for AF.

Been having sore breast, peeing a lot more, I’ve also been getting headaches the last 2 days and I never get headaches. Is it possible I’m pregnant?