Hello mate.
I'm sorry that your prostate concerns have led you here, but welcome to the forum.
At 45 years old, you're younger than most of us old codgers and you're bound to be anxious. Is there any suggestion that your rise in PSA could be caused by any other prostate problems? Your Pi-Rads 3 score means they are unsure of any anomalies found, that coupled with the gradual PSA rise, is why they are doing a biopsy. The biopsy results will give a much clearer picture of your condition.
I'm sure most on here would agree, the initial investigative procedures and waiting for results, are the most worrying time. All I can advise is take one step at at a time and don't get ahead of yourself.
Please keep us updated, they'll always be someone here to help and support you.
Good luck mate. 👍