Started Period A Day Late On October 19th Was Suppose

Started period a day late on october 19th was suppose start on the 18th but didnt start till the 19th after being sexually active with bf my menstrual which is normally 3-4 days long this one was a lil usual cause it started then stopped on the 20 but on the 21st came back was brown till the 23rd now a week and a half later go to use restroom and had brown spotting in underwear and wiped and seen really light pink on tissue...Help