The effects of long-term use of the morning after pill have not yet been fully assessed, therefore it is not recommended for regular use as it could be dangerous to your health. If you take the morning after pill more than twice a month, you should consider using a more suitable form of contraception instead.
The non-hormonal IUD (intrauterine device) is the most reliable method of emergency contraception and can be fitted up to 5 days after unprotected sex to prevent pregnancy. The non-hormonal IUD can last for 5 years, so you will be protected from pregnancy during that time. Although, if you do wish to become pregnant, the device can be removed by a doctor.
If you regularly have unprotected sex, you are significantly more likely to become pregnant. Therefore, you should explore which birth control methods may be right for you. Condoms and the contraceptive pill are two of the most popular methods, but if you need something with longer-lasting effects you could consider contraceptive implants, injections or IUDs.