I had implantation spotting with ds. From all that I read, it most commonly occurs between 6-12dpo, is usually brown in color, though sometimes it can be red or pink, and last no more than 2 days.
Here is a description of mine. 7dpo, brown spotting lasted 2 days. It did turn red, but there was very little of it. I did wear a pantyliner, and I actually mistook it for my AF, though it seemed too light. I got a + HPT, 7 days later.
Steph, wife to C, mama to O :, E , and I :.