Unintended pregnancy is more likely than people think

Without contraception, 21% conceive within a month and 73% within six. The twenties are the most fertile years of your life.

Without contraception, 21% conceive within a month, 52% by three, 73% by six and 95% by twelve. The twenties are the most fertile years of your life — which makes them the highest-risk years for unintended pregnancy. Since sperm survive about a week, there is no reliably safe day.