Should I start another pack of Vibin if I'm not pregnant but the bleeding doesn't occur?

In the described case (certainty about the absence of pregnancy) you should start the next pack of tablets normally and in a timely manner. Sometimes when taking tablets such as Vibin, there may be no withdrawal bleeding. This may mean pregnancy, especially if the medicine has been taken incorrectly. Then it is recommended to perform a pregnancy test, contact with a gynecologist. Sometimes, however, withdrawal bleeding does not occur despite the absence of pregnancy and this is the result of the action of hormones from the tablet on the endometrium, which does not increase in a given cycle enough to exfoliate and cause bleeding. Double absence of bleeding should prompt you to contact a doctor for gynecological control. I enclose additional information: https://www.gdziepolek.pl/produkty/82280/vibin-tabletki-powlekane/ulotka/204592