TMI Nipple discharge - photos

Ok so we are ttc and AF is due in 2 days. A few days ago when getting in the shower I noticed a black dot on my right nipple, I squeezed it and a brown discharge came out. I noticed it again today so this is the second time.

I have had some nipple tenderness but put this down to symptoms of possible pregnancy alongside sickness and tiredness.

I’m worried as I don’t think this is normal.

Has anybody else ever experienced anything similar