Though the morning-after pill and the brand name Plan B are often used interchangeably, there are many different types of emergency contraception, and they don't all operate the same way. For example, the brand Ella is a prescription morning-after pill that can be used more effectively for a longer period of time.
While the pill is designed to prevent fertilization, much like Plan B, the hormone in Ella can also stop a fertilized egg from implanting in the uterus. According to Felice Gersh, MD, an ob-gyn, author, and founder of the Integrative Medical Group of Irvine, this makes it a good option for anyone who thinks they've already ovulated. Knowing about differences like these can help you figure out which type of emergency contraception would be most effective for you — so, don't hesitate to reach out to your doctor.