Latest time to hope for bfp?

Jasey • Married October 2014 and Pregnant with #1 due October 2015!
As of today I am 8 days late. I'm pretty sure every test I've taken has been negative. Tomorrow I am going for a blood test to see what's going on exactly. I was just wondering if any of you ladies recieved a bfp later in their cycle while having a negative at 8 days late?