I don’t know why you would think it creepy. It is a simple fact. Read what I said and read the leaflet that accompanies birth control pills, patches, foams or even condoms. They all have a failure rate. A minimum of 1%.
Statistically for every 100 sexually active women using any form of birth control at least 1 becomes pregnant over the course of a year. For some forms as high as five or more. Statistically.
I think what was so creepy was and apparently still is your unnatural interest in women’s reproductive activities. Just Eeeew! :-)