I have gone through your mail & u have said that you began your periods today.
So, you can mark today as Day 1 & start taking your pills.
Take 1 pill a day & make sure you are taking them approximately same time everyday.
You may have to re-label the package...but as the pills are color coded, I hope you won't have much problem in keeping track of the schedule.
lo 28 is a very effective birth control pill, given that you are taking it regularly.