When Can My Sister Expect Her Period After Taking Primolut N And Postinor 2?

Hi my sister wanted to delay her period and took Primolut n 5mg for 2 days starting from the day before her period. Her normal period cycle is about 31 days. Unfortunately she has had unprotected sex the day after she stopped taking the Primolut. She has also taken Postinor 2 as an emergency contraceptive within few hours of unprotected sex. When can she expect her periods and what are her chances of pregnancy? Thank you.