help !!! please !!

ch • Sun, May 19

i take lo loestrin fe a 28 day pack combination birth control . i take it every day at exactly 9 pm . i’ve been on it for about a year now also . i’m in the middle of my active pills like not even close to my “ period week “ and i’ve been having brown discharge . i take it on time so it couldn’t be breakthrough bleeding . i haven’t missed a pill so what is this ?!!???