A couple of comments:
1. I wouldn't wait "a few weeks" to see a urologist. True, if you have PCa it is probably slow growing, but why in the world would you want to sit around and wonder?
2. Most insurance will pay for a free PSA test and it can be done along with the blood sample from a regular PSA test. If your previous blood sample isn't around...just call your PCP and tell him or her that you want the test done. Go in and give the blood and have them run the test (no sex for 48 hours prior to any PSA test).
3. I don't know why you are seeing a urologist and it may have nothing to do with the prostate. BUT...with that PSA increase you definitely do need to have a DRE.
4. In general now, since you are concerned, you need to TAKE CHARGE...
Good luck and tell us how you progress.