As Jeff noted below, your PSA density is very low which is very favorable in terms of explaining why your PSA is somewhat elevated and slowly trending upward.
For what it is worth, I had an MRI that showed a PIRADS 4 lesion and had a follow up MRI-guided biopsy which included four cores sampling that lesion; those all were negative for prostate cancer. So it is very possible that the lesion that showed up on your MRI is caused by BPH or some other factor other than cancer.
The biopsy itself if really nothing to be all that concerned about - it is a quick procedure and generally well tolerated. The pathology report on the biopsy samples will probably be posted in your medical provider's patient portal before you hear from your doctor so you should make sure you have access to the portal and check it frequently after the procedure.
All the best to you.