A.L.
the best sign is to check your urine's color. if it's too yellow, then yes, more water.. if almost clear, then you are doing ok. However, that is IF you are actually urinating... with no water in your system, then that isn't good.. I would try some Camomile Tea.. Keep in mind, dehydration isn't just about thirst.. it's about your entire body needing water to "fuel" itself and work efficiently. this includes blood sugar levels, kidneys and your emotional state.. water affects EVERYTHING (in my opinion) ...
I wish you the best