Fast enough emergency contraception, such as the Escapelle pill, is an effective method of preventing pregnancy, although it is not a method that guarantees 100% success: https://www.gdziepolek.pl/artykuly/tabletka-po-czyli-antykoncepcja-awaryjna https://www.gdziepolek.pl/kategorie/tabletka-po If the partner does not use another contraception, then to assess the likelihood of pregnancy, it is worth taking into account the day of the cycle on which the intercourse took place and whether it actually was the risk of ineffectiveness of the condom used. Regardless, if more than a month after intercourse, several different pregnancy tests give a negative result, this indicates the absence of pregnancy. Blood or urine tests after such a time after intercourse should easily detect pregnancy if it happened. Menstruation after taking Escapelle tablets generally occurs on time and is usually normal. However, sometimes it can occur a few days later or earlier. However, the Escapelle documentation recommends that you contact your doctor if your menstrual bleeding is delayed for more than 5 days. Based on the ultrasound image, the gynecologist is able to answer what may be the cause of amenorrhea and exclude pregnancy. I enclose additional information about Escapelle and our material that may be of interest: https://www.gdziepolek.pl/produkty/27577/escapelle-tabletki/apteki https://youtu.be/g2LhgyZi0jo