[header] How to use the morning after pill [title] Understand how the morning after pill works. [step] Most morning after pills are formulated with a synthetic version of the hormone progestin (also called levonorgestrel). This hormone works by keeping your ovary from releasing an egg. 
If there is no egg, there is nothing for sperm to fertilize. [substeps] If you are close to ovulating or have just ovulated, the pill has a significantly smaller chance of being effective.