In the U.S., progestin-only EC (like Plan B One-Step) is available without a prescription. Ulipristal acetate EC (Ella) is available with a prescription and Copper T are available from your doctor. Some forms of EC, like Copper T can be used to prevent pregnancy up to five days after sexual intercourse.
Some brands of daily birth control pills can be used as EC. It's important that you consult with your doctor about your options.
Some forms of EC lose effectiveness for women over a certain body weight depending on the drug. Read the instructions carefully and always consult a health care professional if you have questions.