Spotting instead of AF

Emilee • 25, married, 2nd grade teacher & cheer instructor,
Af is usually very regular 4-5 days medium flow and start on time! This month has been crazy, started with spotting the day AF was to arrive. It lasted for 5 days followed by 3 days of medium flow, followed by 2 more days of spotting and reddish brown discharge. Any ideas why? I've usually been very normal ad consistent, should I be concerned?