birth control?

so this is my first time taking birth control, i’m on the pill. my dr never told me how to use it at alllll. so i’m kind of confused. do you still take the pill when you get your period? or do you not take the pill and start it again when ur period finishes?? & i’m 8 weeks PP. when i first started them going on 3 weeks ago i had just gotten my first period after birth, so i waited until my period was done to start the pills, 2 weeks after my period ended i got ANOTHER period. now i’m on day 4 of this 2nd period somehow. i have one week left of white pills before i hit the brown pills, what do the brown pills do? do i have to take those AND get a new pack of pill and take the white ones too? i’m so lost lol. i took it after i got my first period, when it ended i started that sunday. then 2 weeks later i got my period again and i’m on my period while still taking the white pills, is that supposed to happen