Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services if there is:
And for anyone, someone who:
Arrange prompt medical assessment if you develop fever, chills, unusual weakness, jaundice, or dark urine after possible tick exposure.
Mention recent travel, outdoor activity, blood transfusions, and whether you have a spleen.
Seek same-day medical advice if symptoms are worsening or if you have dark urine with reduced urination, increasing breathlessness, marked dizziness, or a fast heartbeat.
People without a working spleen or with a severely weakened immune system should seek prompt assessment for fever even if other symptoms seem mild.
Routine testing immediately after a bite may not detect a new infection.
A healthcare professional can advise whether observation or later testing is appropriate based on the exposure and your health risks.
And for anyone, someone who:
The article also says
A tick bite without symptoms is not usually an emergency.
Every sign above is quoted from the sofidex article on Redwater fever. If you are not sure, err upward — it is always reasonable to be checked.