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calendar date 13 weeks ago
Based on a normal gestation period of 40 weeks the due date is May 7th
Adding five weeks to October 13 gives November 17.
July
July
If you were 13 weeks on 18 December you conceived on or around October 2nd.
13 to 14 weeks.
40 weeks
The date of October 13, 2010 falls in the 41st week of the year.
There were 13 weeks between October 1 and December 1, 2009.
13 October 1959
13 weeks and 1 day.