Nuvaring + period

So I started nuvaring on October 25th and I changed it on the 15th, mg doctor said if I didn’t want to bleed just change it the same day.

So I took it out the 15th and started a new one the 15th.... anyways I started heavily bleeding today and the Nuvaring is still inserted and I’m not supposed to start another one till dec 6th..

Why am i bleeding so much ? Is it normal? Will it end soon?