Hii I Had Unprotected Sex Today At 3am In The

Hii I had unprotected sex today at 3am in the morning with my wife and she told her period is on 29 October and she don' t wants the baby now , so please help me if she can take any medicine to prevent the pregnancy or nothing can be done now , and she is 20 years old .and also is it fine if she can have ipill at this age .please could you help me with this issue.