Can anyone help please

First time me using opks and all my test have been light then one day it become dark but today it’s light again my cm is just watery it has been like that since the day after period it’s not changed at all I im sure I’m not ovulating as the lines have not started to get much darker only that one day !!

My sis said to do one after first morning pee and one just after 12 then do one later on tonight I’ve been doing the opk day period stoped as my period is all over the place have been for last 2 months before they were 28 days for 5/6 days long so I just have no idea on what’s going on right now