Best days to BD when TTC

Hi Ladies! 
I had questions on the best days to BD to increased chances of conceiving this month. 
Background: had a miscarriage in August and ready to ttc again. No previous children or pregnancies. 
Question: on the calendar, it shows a percentage for each day of your fertile week. I've read that it's not the best to BD on the day you ovulate since it could be too late. I've also read that having BD everyday could decrease your chances. 
Could some help on when it would be best? 
Thank you!