fertile period

Medical Dictionary

fertile period n.
The period in the menstrual cycle during which conception is most likely to occur, usually 10 to 18 days after the onset of menstruation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
fertile period

noun
the time in the menstrual cycle when fertilization is most likely to be possible (7 days before to 7 days after ovulation) 
WordNet® 3.0, © 2006 by Princeton University.
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