Timing is off

Does anyone else feel like maybe they don't have unexplained fertility that maybe the timing is just off?

When you go back and look at BD 14 days before AF I only maybe BD 3 out of 10 months correctly and 2 of the months were a day early and only 1 of 10 months was exactly 14 days before AF.

For example, in July I got my period on Friday and we BD two Fridays before that. Do I have this right?

Also if you get your period after 5 pm then what?

I get so mad at myself and my husband for. It trying past my ovulation window or when I think it is. Anyone else with me?