spotting from period to ovulation

hey ladies, I'm ttc pretty regular cycle, changes a day or two 27-29 days. the past two cycles after my period is over I've been spotting brown until my fertile window starts. I'm just curious if this is something I should mention to my doctor or if anyone knows what is causing this. my typical period is 5 day and a little spotting on the 6th day. But my last two have been 5 days of spotting. any insight would be greatly appreciated !