What could be the reason why I have spotting and bleeding when using Drovelis?

When using oral contraceptives such as Drovelis, irregular bleeding or spotting may occur, especially in the first months of taking the pills. This may be due to the way the tablets act on the endometrium (endometrium): https://www.gdziepolek.pl/artykuly/jak-i-dlaczego-zglaszac-dzialania-niepozadane However, if everything was fine for the first three cycles, then persistent spotting should be reported to the gynecologist. Only a direct examination in the office can be helpful in determining the exact cause. I enclose additional information about Drovelis: https://www.gdziepolek.pl/produkty/111326/drovelis-tabletki-powlekane/apteki