8dpo and decided to use my last test

I had my last two opk and decide to go ahead and use them even tho I know I had ovulation on CD18 and I'm currently on CD27 ..... I took one of the test at 5dpo and got a close to positive results and today at 8Dpo I got this . Darker then 5dpo.. I know that sometimes opk can be used to see if your pregnant not sure how true this is .. any thoughts .? I'm sure I'm just being crazy lol I'm trying not to take a hpt until closer to my period which is a week away .