If the numbers were correct and your aim was to reduce pregnancies, you could prevent 90% of pregnancies by getting roughly 90% of sexually active women to take the pill. Getting 99.95% of sexually active men to take the pill would have NO effect whatsoever on the pregnancy rate, because the remaining 1 in 2000 men would continue to meet and impregnate a woman roughly once every hours for roughly 12 hours a day with breaks for food and resting his dick for 9 months straight, with time to visit 430 women a second time in case these miracle impregnators somehow didn’t always impregnate on first meeting a woman. (This would very drastically reduce diversity in the gene pool and the world would be very very very badly interbred within two generations.)

But of course humans don’t behave like the numbers suggest AT ALL, thank goodness.