I am currently halfway through the Vixpo pack and I had bleeding today as if I had my period - what could be the cause, should I go to the gynecologist?

Birth control pills may cause reduced cycle control; Usually, however, after such a long time, intracyclic bleeding no longer occurs. It is worth thinking whether there have been any recent changes in your life that could have affected the cycle disorder, e.g. stress, different diet, diseases, etc. It is also worth seeking medical advice - especially if the situation persists or the problem worsens. I encourage you to read: https://www.gdziepolek.pl/kategorie/leki-na-zaburzenia-miesiaczkowania