S.A.
You could still be on your period, or it could be breakthrough spotting if you're on the pill. When I was not on the pill, I'd have my period for a few days (normal, heavy flow) then it would completely stop for a day or two. Then, I'd get another couple days of very light spotting before my period actually ended. Now that I'm on a low-dose birth control pill, I don't have that issue anymore - I traded that in for occasional breakthrough spotting. I've noticed this only happens if I'm a little late taking my pill (even by just a couple of hours). I think having the spotting for once cycle probably isn't abnormal, but if it continues for several cycles (and this isn't a normal thing for you) then maybe call your GYN and talk to the nurse and see if she suggests an exam.