|@acsacs77: unless your periods are almost always VERY irregular, it is virtually impossible to become pregnant during the week immediately after your period. Look up "fertility cycle" for more info. Basically, you can only get pregnant within a specific window during your monthly cycle. Simply knowing this and avoiding your most fertile times of the month is 99% effective at preventing pregnancy without any other form of birth control, by the way. Every woman--and man--should be aware of this information.