There is a chance that fertilization may have occurred. According to the leaflet, under no circumstances should the interval between cycles of use of the patch be more than 7 days. In case it is longer than 7 days the contraceptive effect may not be effective. Then it is necessary to use a non-hormonal method of contraception for 7 days at the same time.

As with combined oral contraceptives, the risk of ovulation increases with each day beyond the recommended interval with EVRA. If sexual intercourse takes place during a prolonged interval of more than 7 days in the use of the patch, the possibility of conception should be taken into account.

It's hard for me to determine the percentage of pregnancy in this case, if you are afraid of conception, please consult a gynecologist as soon as possible and recommend his recommendation. A pregnancy test can be taken 10-14 days after intercourse to give a reliable result.

I encourage you to read:

https://www.gdziepolek.pl/artykuly/tabletka-po-czyli-antykoncepcja-awaryjna

You can make an appointment for a teleconsultation with a specialist here:

https://www.gdziepolek.pl/telekonsultacja

The availability of Evra patches in pharmacies in Polish can be checked here:

https://www.gdziepolek.pl/produkty/28646/evra-system-transdermalny/apteki

For the future, keep a strict eye on the date of application of the new patch and, in case you forget it, use additional contraceptive methods, such as condoms.

If you have any questions, we are left to answer.