My period usually lasts 4 days and has now lasted 7 days, turning into brown discharge. i have just started taking the pill. why? has my period finish

OCP bleeding: Whenever you start taking an oral contraceptive pill (OCP), the first 2-3 months it's common to have irregular bleeding or at least a change in what you consider normal bleeding. Your body is still getting used to the presence of the hormones in the pill. I recommend staying on the pill for 3 months to see if your body adjusts to it. There are many other brands you can try.