CD 13 and stupid OPKS

Well today I am on CD 13.. I really wish that I could remember to TEMP when I wake up, it has been awhile I need to get back into that habit.. Well I started using the OPKs on CD 10 this month, pretty dark until today and they were faint.. I am using a different brand, so I wasn't sure what to expect... I guess we will see how it goes, I am pretty sure I have not Oed yet... Bring on the O!