Hey Michelle
Have you read whats happened to me? It could be the same for you. Let me go and find the post and I'll copy and post here.
YOur not out of the game yet sweetie!

Quote from Merideth
Naomi - Implantation bleed usually occurs about 5-10 days post ovulation and is when the little embyro buries itself into the lining of your uterus. Some women will actually bleed a little during this time - it can be fresh, red blood, pink or brown discharge as this is just old blood from a few days earlier.I don't think it is a rare occurence at all. So you are definitely still in the running

You may have o'd later????
I got a faint BFP yesterday when i tested and then got nothing this morning aswell, we are on the same boat here. Im retesting tomorrow, that will determine it one way or another.