OPK help 🤔

Samantha

Hello 👋🏻 1st month using opks and looking for some advice/ experiences. I am using both the Wondfo and CBD brands. Currently on CD15. I have had 5 days of flashing smiley on CBD and my Wonfos always look super close to positive. I may just be impatient here but I was wondering if anyone can shed some light on why my Wondfos always show this dark? Thanks a bunch 🤗 ( the pics are CD 12-15)