Solve this mystery? Maybe tmi?

I swear I neve had this before, but now that I'm ttc I do..or maybe it's just that I pay attention more and just never noticed it before. So basically a few days before af (1-4) I will get a clear brownish red discharge.. pretty much just with wiping. Quantity varies. So strange?! Anyone else have this or know what it is?

The first time I really noticed it my period was a few days late so I kept hoping it was some sign of pregnancy. But now I've noticed it pretty much every month!