Question about OPKs

So confused ......I bought a kit of Clearblue Easy OPKs. I was getting very faint lines through the week last week, then darker, but still not as dark as the control line on Friday and Saturday. I thought that meant O was getting closer...

I just took one now and it's so light it's barely there. Does that mean that O came and went? If I got a decent line last night (NOT as dark as control) could that mean I O'd today? Or is it over? I am so confused and would really appreciate any advice......TIA, I don't know what I would do without this site!