Positive OPK?? First month using

We have decided to use opks for the first time this month (been ttc since July 2014)

Anyway I am on CD17 today and so far all opks I have done have been very faint lines (see first pic). Just done one now (second pic) which seems a lot darker and fuller - I know it's not as dark as control but I have ewcm today too so am wondering could it be possible I'm ovulating today but just don't have a high lh surge level? TIA and baby dust to all x