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I went to http://www.intmed.mcw.edu/clincalc/pregnancy.html and put in a due date of Sept 18,2007 and it shows conception date of Dec. 26, 2006. Remember that is based on a 28 day cycle so add or subtract days depending on how long your cycle is. Also, sperm can live in a womans body for 3-5 days, so it can be from sperm from days before that. congrats on the pregnancy =) The answer to this question is simple... If the doctors set it then there is no real way of knowing you would just know the general month which would be December of 2006.

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18y ago

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