Many doctors say that calculating your ovulation can actually hinder your chances of getting pregnant.
Some reasons for this are that even though you are checking and counting, the egg may be released at an unexpected time and you may miss the window.
Some couples 'store up' until the days when ovulation is expected and this can actually lower chances as a man needs to release ejaculate regularly to have a healthy new batch available. When sperm has sat doormant too long, it kind of goes stale lol.
Because of the previous point, it is actually better to have sex every two or three days.
And one common misconception is that it is better to have sex on the day of ovulation itself, but in fact it is actually better to have sex two or three days before so there is viable sperm waiting for the egg. Sperm can live very well up to two days and even three for optimum chances of fertilization. Sex on the day is also great but it is good to have those little swimmers already there just in case.
In short, just have regular sex and preferably every two to three days.
Oh and a womans contractions during orgasm help pull sperm upwards in the right direction. Better to orgasm with your partner or just after he ejaculates. If you happen to orgasm before, it is good if he can ejaculate within a couple of minutes after so there is still that chance of the pulling effect helping things along.
Hope this helps, I'm sure you know some of this already but just thought I would share what I have learned. Good luck!!