It is controversial how to manage this problem. You have no problems now. Some elect to have the kidney removed if it has poor function without a chance of recovery. This would spare you an additional operation. But, given your age, you could elect to try and salvage the kidney.
Some patients develop problems with pain, blood in the urine, and hypertension.
It is hard to prove, however, that the kidney is responsible for the high blood pressure. The incidence of hypertensive due to unilateral renal obstruction is low. At any rate, because you are asymptomatic, you may discuss deferring a workup of the kidney until after your pregnancy. Lastly, a nephrologist is a medical doctor. A urologist is a surgical physician.