Stressed abt this pos/neg hpt

Angel • Mother of 4!
I'm 3 days late on 16 DPO an all I'm getting are bfn! I got only one bfp day b4 af then I missed af and nothing. With my last son I didn't get a bfp til I was 5 days late so I'm wondering if it's gonna do that again idk wat do you think I should do??? Should I take another hpt Friday an if it is bfn make dr app or wat???