I think you don't too much serious concern to be worried about, but no one could predict a PSA rise, too many factors involved. Like someone said above, pay attention to the velocity of the PSA if it rises, that can be a tell tell sign of something not good ahead. It was my velocity that got me into PC trouble so fast.
I hope you stay low for years to come.
David in SC
Age 57, 56 at DX, PSA 7/7 5.8, 7/8 12.3,9/8 14.5
3rd Biopsy Sept 08: Positive 7 of 7 cores, 40-90%, Gleason 7, 4+3
Open RP surgery 11/14/8, Right nerves spared, 4 days hospital, staples out 11/24/8, 5th cath out on 1/19/9
Pathlogy Report:Gleason 3+4=7, pT2c, 42 grm, tumor 20%, Contained in capsule, one post. margin, clear lymph nodes
2009 PSA 2/9 .05, 5/9 .10, 6/9 .11, 8/11 ?
Lastest 7/13 met with Rad. Oncl, considering options, 7/20 Catheter #6 after complete blockage, scarring closed up bladder neck, again