Does the fact that the condom did not leak after pouring water mean that it protects against pregnancy 100%?

No, a condom does not provide 100% protection against pregnancy. Although a condom is an effective contraceptive and can significantly reduce the risk of pregnancy and the risk of transmission of sexually transmitted diseases, there is some risk that cracks, leaks or other problems may occur that can reduce the effectiveness of the condom. According to studies, the typical effectiveness of a condom in preventing pregnancy is about 85% - 98%. The fact that you did not observe leakage after pouring water into the condom does not mean 100% that fertilization did not occur, but there is a high chance of it. To be sure, after about 10-14 days after intercourse, you can perform a pregnancy test. I encourage you to read: https://www.gdziepolek.pl/blog/historia-antykoncepcji-metody-zapobiegania-ciazy-kiedys-i-dzis https://www.gdziepolek.pl/artykuly/jak-prawidlowo-stosowac-antykoncepcje