If you are close to ovulation, EC may not be able to prevent pregnancy if you wait 5 days. Therefore, the best thing to do is take EC as soon as you can get it. A thorough and up-to-date academic review of the medical and social science literature on emergency contraception is available here .
Employer Identification Number - EIN. A unique identification number that is assigned to a business entity so that they can easily be identified by the Internal Revenue Service. The Employer Identification Number is commonly used by employers for the purpose of reporting taxes.
The Superannuation Product Identification Number (SPIN) is a number used to identify an individual superannuation product, compared to ABNs and SFNs which identify the entity. The SPIN has been partially superseded by the USI. Sunsuper SPIN: SSR 0100 AU. For more information on the SPIN see here.