EllaOne is the most effective emergency contraceptive product on the market at preventing pregnancy after unprotected sex or if your contraceptive method has failed. Unlike the older emergency contraceptives, EllaONE can be used up to 120 hours (5 days) after unprotected sexual intercourse although it is more effective if used sooner. You should take EllaOne as soon as possible after sex, and within a maximum of 5 days (120 hours). Sperm can survive up to 5 days in your body after intercourse. EllaOne is suitable for any woman of childbearing age, including adolescents. You can take EllaOne at any time in the menstrual cycle. EllaOne does not work if you are already pregnant. Although, if it is taken it will not interfere with the pregnancy.If your menstrual period is late, there is a possibility that you may be pregnant. When your period is late or when you have symptoms of pregnancy (heavy breasts, morning sickness) you should consult a doctor or other healthcare professional before taking EllaOne.  EllaOne is a contraceptive used to prevent a pregnancy from starting. If you are already pregnant, it will not interrupt an existing pregnancy. If you have unprotected sex after taking EllaOne, it will not stop you from becoming pregnant. Unprotected sex at any time during your cycle can lead to pregnancy. EllaOne is not to be used for regular contraception If you do not have a regular method of contraception, talk to your doctor or healthcare professional to choose one that is suitable for you. How EllaOne works EllaOne contains the active ulipristal acetate which acts by modifying the activity of the natural hormone progesterone which is necessary for ovulation to occur. As a result, EllaOne works by postponing ovulation. Emergency contraception is not effective in every case. Of 100 women who take EllaOne approximately 2 will become pregnant. Emergency contraception does not protect against sexually transmitted infections only condoms can protect you from sexually transmitted infections. Ask a healthcare professional for advice if you are worried about this.