Intimacy and Arguments

Why is it lately that something happens every time I'm ovulating? Seems like either the husband is having trouble finishing the job or like this time...he does something to piss me off so badly that I don't even want to be intimate. I was so excited when I finally got the positive test for ovulation and now I'm twice as ticked off at the hubby. First for what he did and second for the loss of another month. How is it some get pregnant so easily and some try for sooo long?