Do I have cause for concern if there is no withdrawal bleeding while taking Vines?

If you used Vines correctly and systematically and there were no factors interfering with the action of the tablets, then the absence of bleeding does not necessarily mean pregnancy. Sometimes the endometrium does not grow enough as a result of taking pills and because of this, bleeding does not occur. If you have doubts about the correctness of the use of tablets or you just want to make sure, you can take a pregnancy test before starting the next package. According to the Vines documentation: "If all the tablets were taken correctly, there was no vomiting or severe diarrhea and no other medicines were taken, it is very unlikely that the woman was pregnant. If the expected bleeding does not occur twice consecutively, it may indicate pregnancy. Contact your doctor immediately. Do not start the next pack until you are sure that you are not pregnant." I enclose additional information: https://www.gdziepolek.pl/produkty/81748/vines-tabletki-powlekane/apteki/w-warszawie https://www.gdziepolek.pl/produkty/81748/vines-tabletki-powlekane/ulotka/195614 https://www.gdziepolek.pl/artykuly/jak-prawidlowo-stosowac-antykoncepcje