To be positive, it is good that you requested a PSA test.
After your visit to urology, they may send you for an MRI scan, which may then rule out the need for a biopsy altogether.
If a biopsy is required, those results will tell if you have an aggressive cancer (a “tiger”) or a very slow growing cancer (a “kitten”) which requires no treatment at all, just regular checks.
You may well have a benign prostate enlargement, so try not to worry too much until you have seen the urologist.
The “urgency” is a government policy under the “two week rule”, which means everyone who might have cancer are referred to a specialist within that time frame, so please don’t read anything sinister into that regarding your case.
Do let us know how you get on and the best of luck!