http://www.netdoctor.co.uk/sex_relationships/facts/morningafterpill.htm
The morning-after pill does NOT protect you from pregnancy for the rest of your menstrual cycle. So either abstain from sex or use a barrier method like a condom.
from http://www.bpas.org/bpaswoman.php?page=75
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No. The emergency contraceptive pill will not give you any ongoing protection against pregnancy if you have unprotected sex again. If this happens, you should seek some advice. It is possible you may need to use emergency contraception again. Emergency contraception is not as reliable as a regular method of contraception. ECPs do not protect against sexually transmitted infections.
http://www.womenshealth.gov/faq/emergency-contraception.cfm
Use another birth control method if you have sex any time before your next period starts. Talk to your doctor about how to choose a birth control method that is right for you.
I suggest going to the doctor asap



