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You can't. The length of the pregnancy isn't that precise.

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Q: How can you calculate time between birth of a child and last intercourse to determine fatherhood without doing a DNa test or knowing date of last menstruation?
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Related questions

How do you determine when a quick changeover will be required?

Sexual Intercourse


Can pregnancy detect in week after intercourse?

No, you need to wait 14 days (two weeks) after intercourse to determine pregnancy.


Could there be a way to determine the sex of the child with a certain intercourse position?

No.


How do you get through PMS?

PMS is a socially constructed illness, it's a vague collection of symptoms attributed to menstruation that can be a result of your feelings towards menstruation. The first step in surviving menstruation is thus changing your attitude towards menstruation and learning more about it. You then look at individual symptoms to determine if they are actually related to menstruation, and look into how to prevent any negative symptoms.


How do you determine if you are pregnant even-though before menstruation?

You can take a pregnancy test from two weeks after you have sex. Other than a pregnancy test or missed menstruation it can be months before seeing symptoms.


What must you calculate to determine the accerleration of an object?

To determine the acceleration of an object, you must calculate its change in velocity per unit of time.


Is it possible to know a woman is pregnant at two weaks pregnant?

You can determine pregnancy 14 days after intercourse.


How can you tell that your pregnant after the 4th day?

You can't; You will need to wait 14 days after intercourse to determine if you are pregnant.


What are ovulation calendars used for?

Ovulation calendars are used to determine when a woman ovulates and will be the most fertile. A woman would typically keep track of her menstruation cycles to determine the best time to get pregnant.


What if you cant remember your last menstruation can an ultrasound determine how old the fetus is?

Yes, an ultrasound will see the growth of the fetus and usually if they see the size of it, they can determine how old the little one is. Congratulations by the way!


What is the chance of pregnancy during menstruation?

It generally does not occur because a woman usually ovulates 14 days after menstruation, however it is not unheard of for women to become pregnant while on her period. The best way to determine your chances is to know exactly when you ovulate on a regular basis. You can buy home ovulation test kits at your local pharmacy to determine this.


How do you know your pregnant after 48hours?

You cannot. You must wait at least 14 days after intercourse to determine if conception was successful.