It should not...: Drastic changes in health like severe weight loss can disrupt a women's cycle, however a diarrhea that only last a couple of days but does not require medical attention should not affect the menstrual cycle. However, pregnancy can occur in unprotected sex even if the man does not ejaculate in his partner's vagina because of the presence of sperm in the preseminal (pre cum) fluid.
Answered 7/6/2017
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