Hello SiB amd welcome
Good advice above.
when you had the routine PSA test was this done by the GP and it was the GP who did the internal (Digital rectal exam)?
Were you tested for infection?
Did you do any cycle riding or have intercourse just before the PSA test as both of these can cause a raised result.
Anyway, whatever the reason for the raised PSA, you are being dealt with very quickly so whatever the result you are ahead.