I would suggest ordering from early pregnancy tests.com...I actually buy their OPK's on ebay, it's like 7.99 for 20 and something like 2$ shipping, and they ship super fast too (they are in the same town as me, and I get them next day lol)...I've always had good luck with their OPK's, especially for the price...With OPK's the test line has to be darker than the control line to be positive...HTH

...Oh and usually you take them 2-3 times a day, never with FMU...It's been awhile since i've used OPK's, but I usually would take one at 11, then 5 and then around 8 or 9 at night...Good luck