I've been spotting for a week

Last Wednesday evening (this was 6dp3dt) I started spotting.

I had some severe cramps and when I went to the loo, a brown discharge (sorry if TMI for you) which I'm told is better than a red/ pink discharge.

I had a bit of a freak-out and got straight into bed, did my Cyclogest and read until I fell asleep.

The discharge was almost gone the next day but I've been "spotting" just a tiny bit in the morning and in the evening since then. All brown so trying not to worry.

I left work nearly two hours ago and as is my custom, I went to the loo before leaving the building. And there is reddish-brown stuff. I'd intended to go to the library on the way home but I drove straight home and have been lazing around.

oh dear, why now??? I am So. Close. (tomorrow's my blood test).