being new to this forum id like to say hello to everyone firstly

ok here goes, ive been using OPKs for a few months now and yet to conceive, however over this last period something strange has been happening with the test results.
i had quite a few tests left over from the previous months so i thought what the heck ill start testing early, im normally a 27 or 28 day cycle with a positive result on day 11, however this time i discovered a positive with the OPK on day 6, which really suprised me. i tested again 2 days later and got another positive result....ive had 2 negative OPK results since then but again im testing positive on days 17 and 18...

i started thinking that the tests i bought were faulty so i bought a new batch but im still getting positives

what the heck does this mean?? is this possible to have so many positive readings in one cycle??

thanks in advance