The expiration date of 7/2009 would mean the pills expire the end of July, meaning you can take them the whole month. Also like Kim said, you should be using another form of protection anyways as bc pills are not 100% affective.
you shouldnt be using birth control as you only source of birth control anyways.you should be using condoms as well. birth controls not 100% and since the pills are expired...even if its by a day...i would say to avoid sex