Fertilitynet's OPKs

I got some OPKs from Fertilitynet (that's the name of it, right?) a while back and I started testing with them last month. Every time I tested with them last month, they came back negative (meaning I'm not ovulating), so I figured I tested too late in my cycle. This month, I started testing the day after AF ended, and I'm still getting BFNs (no ovulation). I'm currently on CD 15 and my cycle averages around 28 days. I have tested positive with CVS brand OPKs, and someone else mentioned that they had problems with the Fertilitynet OPKs, so I'm wondering if it's just a bad batch of OPKs or if I'm not O'ing. It's so stressful. I'm not getting a second line at all --- only a control line. I think I'm going to ditch the rest of them and buy CVS brand again. Another wasted month.

Anyone else have issues with this??

Re: Fertilitynet's OPKs

I like the CVS ones, but with a 28 day cycle, you should if its regular O between days 12-16.

Re: Fertilitynet's OPKs

I'm somewhat irregular. I jump from 24 days to 32 days, averaging on 28. That's why I don't know exactly when I'm ovulating and need the help of OPKs. What's frustrating for me is not knowing whether the tests are faulty or if I'm not ovulating every month. The easy solution would just be to BD every other day throughout the month, but with my DH & my conflicting work schedules, it's an impossibility. Sorry if TMI and TIA for more advice.