Nope. Just make sure you eliminate other, more usual causes of elevated PSA before you agree to a biopsy. Prostate Health Index (PHI) is a better test than PSA alone. No sex or bike riding 2 days before it.
Tall Allen knows so much more than me, but you are correct that many reputable cited texts use a velocity of 0.75 / year as a very general guideline for being "worrisome" for cancer. Looks like you are half of that. So don't worry just yet, follow Tall Allan's and your doctor's advice.
You don't say if there was a specific reason for you to start prostate cancer screening early, nor when you started.
The United States Preventive Services Task Force periodically issues recommendations for various cancer screening procedures. I get the general sense that many (perhaps most) men here have not followed their recommendations, which continue to be very controversial among urologists.
But I myself don't reject their reasoning out of hand. There should be a reason you are getting a PSA reading. A broad reading of this may place your apparent alarm in context.
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