14dpo & opk still dark??

7 days before period.. I think I’m 14 dpo.. because I tested positive and I got a lot of Cm and blood around that time.. however.. my opk tests are still coming out pretty dark.. usually it goes back to being supper faint when I past before or past ovulation.. but this has stayed kinda the same.. Any ideas on what may be the cause?? Or is this normal??