Im confused as of now =(

I would appricate if any of You ladies can help me out im wondering why im on CD 52 25 DPO and BFN's then wanted to know are there ways to determine if you Ovulated at a later time then i expected also i tested monday night and ended up with BFN my appointmemt with OB is not until January i just want to know your thoughts or if any one of you ladies experience a missed peorid as of now im 20 days late. Thanks ☆