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Welcome and thank you for the question.
If you are not coughing up blood, then the blood is not from the lungs or the lower respiratory tract. If the bleeding was from the upper respiratory tract, you would have a slight cough or discomfort in the throat. If you do not have that, then it is likely that the blood is from your mouth.
Inflammation of the gums (gingivitis) can cause some mild bleeding. You will see it when you rinse your mouth in the morning or when you have not eaten or drank anything for quite some time. There may be no other symptoms of gingivitis like pain , toothache etc.
Please consult a dentist for a thorough checkup.
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