myturn, I had light bleeding at 14dpo with DD. I was sure it was the start of AF and almost drank a bottle of wine to drown my sorrows... Not opening that wine was the best decision I ever made... B/t was at 16dpo and by then the bleeding had almost stopped... But mine was pink, not red...
And I know this feeling all too well. I wish I had some words of wisdom to tell you what to do, but in my experience you kind of have to grope through the dark to find your answer because the answer is different for each of us... You'll know it when you find it. :hug:

