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.
A nine-digit employment identification number is approximately to businesses what a Social Security number is to individuals. When using an EIN in financial dealings, reputation counts, so your business must be trustworthy. A DUNS number, issued by Dun & Bradstreet, is sometimes required along with an EIN to establish certain credit relationships. Businesses may also be asked for a TIN, or taxpayer identification number.