the pill (ik again)

liz

my last period began on August 10 and lasted until the 17th. I began my combination pills on the 18th of August, and it is the last week of the pack. I took the first green pill last night and I’m still confused on when I should be getting my period? I still have not had sex yet, I just want to make sure this pill is the right pill for me. any concerns I should be worried about?