The pattern then was have a headache on Saturday, take ibuprofen, blood
in saliva on the Monday - rest of the week often a
little brown discoloration or else fine.
I have had my teeth cleaned, gums have receded a little but otherwise no problems were noted. Today I tested the theory that perhaps the headache was the cause of the blood, this might actually be the case from what I've been observing, makes me wonder if it is sinus related.