Never get a positive OPK?

My hubby(31) and I (26) have been TTC baby #1 for 10 months.

I normally have 20-25 day cycles.

The past 3 months I've been using digital opks, on CD 6 I would get a low reading. Then on CD 7-11 I would get high readings....never peak.

Normally I stop testing by CD 11 because those sticks are $$$. I have tried using regular dipsticks but those things are just so hard to read...the test line never gets as dark as the control.

So my question is, is there something wrong with me if I'm not getting peak ovulation? Do I have PCOS?