Advise

So I need some advice. In months past my SO and I have had sex 3 or 4 times just in my fertility window. He works long days and is very very tired when it's time to get down and dirty. This month I'm thinking of changing it up. Should we just do it everyday during my fertility windows and every other day when I'm not in my window. Just in case my ovulation tests are wrong. I have a feeling they may be cause after it gives me my 4 day window I still have that fertile clear stringy CM.