L.S.
Hi J.,
for the first time you should start with your first day of your period. there is a sticker which you could put over the printed days that it would fit with your days. i also heard that tons of women start on monday (thats why all the girlfriends have period on the same day! hahaha) and also heard that it really doesn't matter, but all my doctors and also the pharmasist and my long experience calls for first day of period. I also wanted to tell you, i don't know if you care, but if you would pick ortho-tri-cyclen (regular no lo which is really not such different) you can get that generic which is tri-sprintec and it is only $15, so it made sence to me (i was getting the same ones and than ask the doctor to change it because you can't get generic on the "lo" ones). Good luck L.