how often a month can a woman get pregnant
The fact is that there are only a limited number of days each cycle when a woman can get pregnant - the five days before she ovulates and the 24 hours after she ovulates. These six days are the only fertile days of a woman's cycle and they take into account the lifespan of sperm (5 days) and the lifespan of the ovum (24 hours).
Aside from this, there is another explanation of how a woman can get pregnant before her expected period. A study reveals that it is possible for a woman to ovulate more than once within a menstrual cycle. Canadian researchers found that out of 63 women included in the study, 10% ovulated twice in a month.