Anyone else experience this?

J
CD 14 - I've had EWCM (yay!). Yesterday, and again today, I noticed my CM was streaked with some blood. It appears to be darker in color so not really fresh. 
I had previously taken a few tests, as my last period was a week late and only had real flow for 1-2 days, light spotting for another 2 - all BFN. (Bummer)
I've never had any blood show up in my CM and don't generally spot...anyone have some thoughts on this??!