If it is within 72 hours of unprotected sex, consider talking Plan B. It is available in most countries without a presccription.
Additionally, you should take 2 pills of your birth control on the Tuesday or the day after your missed pill. You should use a barrier method of protection for the remainder of your cycle.
If your period does not arrive as scheduled, you should take a pregnancy test.
Good luck. I understand it may be a nervous month for you.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.