Implantation bleeding advice needed

Penster
Hi ladies,
I've been TTC #1 for almost a year and I think i am just getting desperate and especially this month I am looking at every single sign and possible symptom. Now I am on CD 23, we BD 6,8 and 10 days ago and my cycles are usually 26-28 days and I never get spotting this early.
Today I went to the loo and noticed brown discharge (sorry TMI) it looked how my AF usually starts although not due for another 5 days. The only change was it seemed to be more diluted with CM if that makes sense? It was more fluid with a hint of colour. 
I just wondered what everyone else's experience was with Implantation bleeding, am I just trying to raise hope? No other symptoms, just really really more tired than usual.
Thanks x