My right kidney (function is 27%) is ectopic and is smaller in size than my left one (function is 73%), would it cause any problems if i got pregnant?

That would: Be a great question to ask an high-risk ob/gyn specialist. My gut is you would be fine. One can live and function just fine with only one kidney, and the small ectopic kidney is still providing some function.

It depends: The independant function of each kidney is less important than the combined total. If your overall level of kidney function is normal or near normal and you do not have difficulty with high blood pressure, then you are unlikely to have any problems with pregnancy. Even transplant recipients that have only one functional kideny are often able to a safe and successful pregnancy.

Depends: Need to know your creatinine level in the blood and estimated glomerular filtration rate. If they are normal, if your BP is ok and there is no protein in the urine, then there is no problem. Studies show that creatinine > 1.5 is a risk for kidney problem getting worse in pregnancy.