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.
What is a 'Tax Identification Number - TIN' A tax identification number (TIN) is a nine-digit number used as a tracking number by the U.S. Internal Revenue Service (IRS). Social Security Numbers (SSNs) are tax identification numbers for individuals, and the Social Security Administration (SSA) issues them in the format of XXX-XX-XXXX.