#safe_period  that time during a woman's menstrual cycle during which conception is least likely to occur (usually immediately before of after menstruation)
  supertype:  phase.time_period__stage  any distinct time period in a sequence of events; "we are in a transitional stage in which many former ideas must be revised or rejected"
  part of:  menstrual_cycle__menstrualcycle  a recurring cycle (beginning at menarche and ending at menopause) in which the endometrial lining of the uterus prepares for pregnancy; if pregnancy does not occur the lining is shed at menstruation; "the average menstrual cycle is 28 days"

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