Good morning, I have a question about the first use of birth control pills. The doctor prescribed me the drug Microgynon 21, recommended the use on the 1st day of menstruation, the use of 21 + 7. With further use of drugs, they are not used on days when there is bleeding, and for 1 time you have to take them on the 1st day of menstruation and here I wonder how it is - since I started taking on the 1st day of menstruation, it means that after the blister is finished, bleeding should occur. But it will only be 21 days, and I usually had my periods after exactly 28 days. Should I take the pills for 1 time these 28 days waiting for bleeding or 21 days? What if after these 21 days there is no bleeding (because the standard was after 28 days), I take a 7-day recommended break, start another blister and then the period will begin? Or maybe after prsotu it is so that with 1 use of tables the period will appear faster - that is, after 21 days.. Please advise.