Patient: I just started taking my first pack of Microgestin 1/20, the birth control on Sunday March 8th. I have never taken any type of birth control before then. I did the Sunday start but started taking it for the first time one week late…. so basically I got the first day of my period on March 1st (a Sunday) and took the pill on March 8th (the next Sunday) because I got confused. How long until the pill will be effective and I can stop using condoms if I’ve been taking it every single day at the same time since then?