I don't think I'd be too concerned. At those very low numbers, seems like a slow(ish) doubling to me.

My RO claims that the rate of doubling is not a big a concern when you're talking about numbers that low. The statistics already posted on here would indicate it's likely too early for imaging to give you much of an answer as well.

Obviously see what your urologist says. For my money, if the urologist didn't suggest it, I might suggest moving to 3 month intervals to keep a closer eye on the PSA for a while. My PSA went up to .091 before we started salvage radiation, that was almost doubling in 6 mos post surgery. There are quite a few folks that think this was potentially a little early. I was comfortable with being proactive.

Best of Luck!