I don't know how you are so sure that you became pregnant on a particular date after having sex. Most of the time it is a range, not one single date, when the lady becomes pregnant. All we want to say is that if you become pregnant during the duration of that menstrual cycle then you calculate the date of your pregnancy from the 1st date of the last period (irrespective of the number of times you have intercourse). It is better to read and discuss some Human Physiology rather than being dogmatic that "I want exact time".

Connect please

If your last period is 9 th July and it’s a regular cycle then you should check for pregnancy if you miss your periods by 3-4 days

Once you miss your periods, test can be done

Once you missed period in August go for pregnancy test after 2 days

Irrespective of the date of sex pregnancy test can be done 24 hours after a skipped period so you can go for a pregnancy test on 10th of August if you have a 30 days cycle