Need advice ladies.

So AF is about 10 days late but every since 20 days ago, ive been testing every single day all BFN.

Ive been testing using FR, Forelife, ebay ones, crystal clear, crystal blue basically just about all the brands.

Anyway, Ive been regular for the last few months (the months before that was irregular as i have PCOS)

Sooooo ... should i give up testing (ie would a pregnancy have turned up BFP by now) and just think that I skipped AF this month or is there still hope? Expected AF was on the 2nd this month.

*sigh*