The morning after pill works by delaying ovulation. By doing this, it means that the sperm have nothing to fertilise so no pregnancy can begin. Unfortunately, if you have already ovulated, then the morning after pill won’t be effective. However, ovulation can be difficult to pinpoint and can vary from month to month.
Some people worry about the side effects of the morning after pill, but most people will only experience mild side effects – if they experience any at all. If there was any reason for the pharmacist to be concerned about you taking the morning after pill (for example, if you were allergic to any of the ingredients) then they would not give it to you.
There are some side effects to watch out for. Deborah Evans says, “A small number of women may be sick (vomit) after taking the morning after pill. If this happens within three hours of taking it, then you will need to take another pill as it may be that not enough of the pill has been absorbed to work. Your pharmacist can help advise you.”
Taking the morning after pill can also affect your next period: making it a few days earlier or later, or lighter or heavier than usual. This is totally normal. However, if your period is more than 7 days late, then you might want to take a pregnancy test.
There is no evidence that ellaOne® has any effect on future fertility and your chance to have children in the future. In fact, fertility generally returns so quickly after taking ellaOne® that we recommend using a condom until your next period, even if you are using another method of contraception like the pill.
Click here to learn more about the morning after pill side effects.