This Emergency Contraceptive from Take Action helps women reduce the chance of pregnancy after unprotected sex, after a contraceptive failed or if you didn't use birth control. You take this emergency contraceptive as soon as possible after you have unprotected sex — it's most effective within 72 hours, or three days, after unprotected sex. This emergency contraceptive will not work if you are already pregnant and the sooner you take it after unprotected sex, the better it will work. HSA/FSA EligibleRestrictions apply; contact your insurance provider about plan allowances and requirements.