light pink to bright red to brown blood

ok, im 23 years old and 5-6 weeks pregnant Ill know for sure after the dr. starts measuring me. Yesterday afternoon after going to the rest room i noticed a really light pink discharge and didnt see anything again untill that night a bit brighter moderate amount of blood. It stopped so i went to bed a little worried but told myself i would wait and see if it continued. This morning i went to the restroom and noticed another moderate amount of brown blood. I feel ok a bit tired but this morning my morning sickness wasnt acting up like it has been for the past two weeks I dont know if i should be alarmed or not somebody please help!