A lot of things can elevate the PSA. Those two test are too close toughter, IMO, i would wait a good six months , then have another test. Biopsies can be as dangerous as any operation, infections seem rampant in Surgries now!
A second opinion is also very important in cases as this. I would go to a different Proctoligist in six months for another test.
If you google "PSA Test" it will show how the PSA test is not as sure as it used to be.