Before DD, I used to always spot 3 days before AF was due. The month that I got pg with DD, I had spotting on days 4-7 (I was really confused that month). When I had spotting, it was all brown. I had it for a little bit and then it would go away. I actually had used a tampon because I thought that it was AF, lol. It ended up not being very much, but it did last for 3 days.
On a side note, did you send me a message? I thought that you might have, but I didn't get it. You can resend something if you'd like