The microalbumin/creatinine ratio test is extremely sensitive to conditions. Certainly, if you exercise or engage in any strenuous activity within 24-48 hours of your urine sample, you can show a false positive.
A normal ratio is less than 30 micrograms of microalbumin/mg of creatinine.
I made the mistake of doing heavy squats in the weight room within 24 hours of a urinalysis and my ratio came back in the 300s.
Also, being dehydrated can affect the test. I had a couple of glasses of beer the night before another urinalysis and did not rehydrate. The test the next morning came back in the 200s.
Every other test I've ever done has come back well within the normal range, usually less than 1, but never higher than 10.
You are relatively recently diagnosed and I can't imagine a situation where you'll damage your kidneys significantly a year after diagnosis. As much as it is a pain in the ■■■, a 24 hour urine sample, done properly, where they measure total microalbumin output over a 24 hour period is much less sensitive to conditions than a spot urine test that measures microalbumin/creatinine ratio. That test is hardly done these days given the accuracy of a spot urine test (if all the precautions are observed) but you can always ask for a 24 hour urine test to be performed. That's what I opted for after my second spot urine testcame back postive and the 24 hour urinalysis showed that the spot urinalysis was most likely a false positive. I had hardly any microalbumin showing in my 24 hour urinalysis.
Beyond that, the ARBs and ACE inhibitors used primarily lower blood pressure have been shown to be very effective at protecting kidneys agsinst further damage and, in some cases, reversing any early damage that has already occured. I would not be surprised if your endo or nephrologist opts to put you on an ARB or ACE inhibitors even if further testing comes back negative. I am currently in an ARB and have had no problems with the low, protective, dose I'm taking.
Good luck and try not to worry too much about it.