How often should we BD?

Stacie • 31 and carrying an Autumn baby
Hi guys. 
​we've tried only doing the BD on my most fertile day. And we've also tried every minute as well as once a day in my fertile week. I've read somewhere that too often means not giving the sperm enough time to form properly but obvs I don't want to miss ovulation! 
​Anyone have any advice on the best approach??!!