Statistically, what are the chances of getting pregnant?

Okay, based on perfect use, the pill is about 99,5% reliable, a condom about 98%. That means a 0,5% of 2% chance of getting pregnant, which is a 0.01% chance of getting pregnant when using those two method in combination for a full year. Not just for one time . That works out roughly to about 0.001% chance per month.