BFN 11DPO, anyone get a positive later?

With my first two pregnancies, negatives up until 16 DPO (the second pregnancy did end in early miscarriage, the first in a full-term boy). With this one, I was at least 18 DPO, but I wasn't charting this cycle so not sure. I think I could have gotten a BFP nearly a week earlier basing it on my symptoms. This cycle I just put off testing as long as I could stand, as this was going to be a "no pressure", "relaxed" cycle.