I bought a box of Boots OPK... Used as indicated, from day 6 of my cycle... and never got a positive. I got a faint 2nd line on a couple of days before my ovulation would have started, but never an actual positive.
Has anyone used them, did not get a positive result, and then got pregnant? I'm not entirely convinced they work as I don't have PCOS, am 29 years old and can't imagine why I wouldn't have ovulated...