I had scheduled my exam at the VUE center around 15 days before. However, as i was observing most of the slots were getting filled in very fast as most of the aspirants want to take the current version of PMP Exam before the end of the year.
You can opt for PMP Home exam. There are lot of slots available for home exam.
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®