Is hubby the problem?

I’m starting to think that the one with the problem is my husband. I’ve been pregnant before (years ago and not with my husband). Every month I get positive opk. I have regular periods. I’m using preseed, taking prenatals, taking maca, I have a healthy diet, I exercise. We usually only have sex about 3 Xs during fertile window because he travels a lot for work. Could there be an issue with his swimmers?