TMI discharge is brown instead of having my period?!

Hi guys. First of all I want to apologise for th attached pricture but I want to know has anyone ever had this brown dishcharge when they were due their period? I was due AF two days ago and have had all cramps and symptoms but no sign... just this brown spotting in my pads and when I wipe. I had a small light bleed mid cycle as well. Me and OH have been TTC for two years, unfortunately any tests I’ve taken are negative. Anyone else any ideas as to what’s up with me xxx