Could Spotting And Brown To Clear Discharge Be Signs Of Pregnancy?

I have a doubt on if am pregnant or not for the reason being that i started my period from Dec. 2 to Dec 8 and on that same day, on Dec 8, I had sexual intercourse with my husband and then on the 13th again. But, then on the morning of wed on Dec. 14 i notice small dots of blood like spotting but then the whole day nothing came anymore. Now, on the following day, on Dec.15 I had again but the same only that the color was much darker like brown, then on Friday Dec. 16 I got some again but it was more like residue like brownish wet, more dark brown but still a small amount. Then by Saturday morning to noon i just had like left over fluids because it was almost clear, only just smear like beige on my pad. Oh, and every day it would only come like one time, just for a while, like just half a day but on and off. So my question is...could it be a sign of pregnancy?