When is intracyclic sliting disturbing?

Hello, When is sting when taking zoely birth control pills worrying? This is my first pack. I know that for the first 2 months it's normal but I'd rather discern. At the start of the tablets, menstruation dragged until 7 days, where it usually lasts about 4/5. Then there were a few days of calm and from about the 11th day of the cycle to the present day that is 16 there is still sting. Once delicate once larger. This is not typical bleeding, such brown or pink/brown sown on the last day of the month. Thank you for your advice ;)