You must do frequent intercourse during your fertile window.
Fertile window is made up of days in your menstrual cycle when pregnancy
Fertile window is made up of 5 days before ovulation and 1 day of ovulation,making it totally six days.This means that pregnancy is technically possible from intercourse on these six days.
Sperms can survive for five days in cervical mucus and your egg can survive for one day, making it 6 days.
If you have a regular 28-day menstrual cycle,then Count the first day of your period as day one. Your fertile window is likely to be around days 12 to 17.
You may do intercourse at any time of day or night, and may do it any number of times during your fertile window period.