Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Go to an emergency department or call local emergency services if symptoms are sudden, severe, or progressing quickly.
Do not wait for the next scheduled scan to report a new symptom.
Seek urgent medical assessment for:
These can be signs of serious pressure on the lower spinal nerves.
After surgery, promptly report fever, increasing wound redness, drainage, wound opening, or rapidly worsening pain to the surgical team.
Arrange a routine medical appointment if you have persistent or worsening pain around the sacrum or tailbone, especially when it occurs with leg symptoms, a lump, or unexplained changes in bowel or bladder function.
These symptoms commonly have causes other than chordoma, but they should be assessed.
The article also says
If you have been treated for chordoma, contact your specialist team about new pain, numbness, weakness, bladder or bowel changes, an unexplained lump, or a clear decline in mobility.
Every sign above is quoted from the sofidex article on Sacrococcygeal chordoma. If you are not sure, err upward — it is always reasonable to be checked.