1/1000 highly effective
"It should be noted that even when the odds of getting pregnant on correctly used contraception is 1 in 1000 (99.9% effective), with over 50,000,000 American women using hormonal birth control each year, approximately 50,000 women in the United States will still face an unwanted pregnancy when they've done everything right."
Added tags for citation needed. 1/1000 (99.9%) needs sourcing, as does the extrapolation that 50,000 face unwanted pregnancies. On the face of it, such products will market themselves as "over 99% effective" or "over 99.9% effective" even if the true efficacy is more like 99.99%. Efficacy will vary depending on type of hormonal contraception. Kauri0.o (talk) 22:19, 20 January 2021 (UTC)