Some leaking post surgery is normal. Watch for signs of infection, redness, fever or feeling general unwell. It is always better to follow up with your PS for a physical follow up. They may do a swab to ensure there is no infection or Seroma.
In some cases a discharge is normal and it resolves quickly. If you wound is still draining excessively and soaking through your clothes then you should discuss with your surgeon.
Thank you for sharing. The fluid you found may be expected depending on your precise case and technique. See your PS who can evaluate your situation. While urgent care may be appropriate for general medical issues, these issues are more specific to a plastic surgeon's domain. Best wishes!
I think that it would be best to contact your surgeon and ask them if they would see you again. It is not uncommon to have some wound separation in the armpit area as this is the area of maximal tension. These areas often heal on their own, but management will best be discussed with you surgeon.