OPK , always negative

I got my first positive with one at 4pm but tested negative in the morning so your time of day should be good. Are you testing long enough? I start after my period and continue until it's positive even if it's past what the calendars say. Might try doing it twice a day. If that doesn't work you might want to go to the dr just to make sure it's all ok.

Have you made sure your even ovulating? Cause if you don’t then it won’t pick up a surge ever.