Thanks for the query.
Sometimes in early pregnancy
some amount of spotting can be seen because of causes like:
while getting embedded in uterus
wall can damage some blood vessels leading to spotting.
-Some women may have bleeding on expected day of periods even in pregnancy.
-Increased blood supply to local organs can cause spotting even on mild friction.
So if you are not having symptoms like pain abdomen etc no need to bother but if your spotting increases or pain arises consult your doctor immediately.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429