Do you think i could be pregnant? i've had no pain, it started out as brown blood, and slowly mixed in pink, now red. and its not enough to fill a panty liner..im on my "heaviest" day and im not bleeding like a normal period. should i buy a test?

Brown blood is a sign of old blood! You can bleed lightly while pregnant. It's not the most common but it does happen. Best bet would be to make a appointment to be checked out. Better safe then sorry! Good luck :)