I think it's common to have some of the hormone picked up by OPKs throughout the month. A feint line isn't a positive - you'd get a bfp from a pregnancy test before the HCG was high enough to turn an OPK positive.
Yes, sorry... I got a +ve OPK then AF arrived the next day, several days late after having had a few BFNs. It is common to have an LH surge around the time that AF is due, although I see you're not near to testing anyway, and lots of women have LH present throughout their cycle. I fervently hope yours turns out to be a BFP for you eventually but don't rely on the OPK to be your result.