Spotting 6 (all the days) days before period

Michelle

I have been going through a lot of months where I spot 6 days before my period starts. On one of the first two days it's a one time wipe with bright red blood and the remainder of the day and days is just brown spotting.

Someone please explain what is this.... I am so tired of having to change my underwear because of spotting before my actual period starts. I am desperate to find out. My doctor (obgyn) doesn't know what to think of.