| http://www.w3.org/ns/prov#value | - So use a backup method of birth control for 7 days.If you miss pills and have had sex without a backup method of birth control, you can use emergency contraception, such as Plan B. You can use emergency contraception for up to 5 days after having had sex, but it works best if you take it right away.Emergency contraceptionIf you had unprotected sex
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