Conception: 30 min to 7 days (even longer). Assuming all is healthy, sperm may reach fallopian tube in 30 min. However, conception depends on when you ovulate (you don't know that, you can gess). Sperm may survive in fallopian tube for 7 days , even longer. We estimate date of birth based on your last period. Gyn will also do us to estimate age of fetus and date of delivery by making measurements.
Answered 2/28/2013
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Conception: If you had a normal period on 9 DEC then you would not be pregnant from sexual intercourse on 3 DEC. If you are pregnant, it is likely that it would be from intercourse on 23 DEC. You doctor can assist with estimating dates.
Answered 11/7/2018
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