TMI, understanding this bleeding?

Sam • Mum of a 2yr old daughter, recovering from a complete molar pregnancy, Adoring fiancé, looking forward to TTC again
I need a little help understanding this, and if it's happened to someone else, 
​So every month for the last 6. My period has come on the 28th lasts for 5 days, 
​This month I had brown discharge on the 26th, on the 27th and 28th I had what I thought was my period, from the 29th I've had a very sticky mucus discharge from a brown to a very light pink, not a lot but enough to wear a liner still have it tonight the 1st, 
​Tested and got a BFN this morning, any ideas?  

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