Could It Be Harmful To Be Pregnant With Kidney Stones?

hi. i have a kidney stones in my right kidney. through ultra sound sound scanning report doctor telling that u have a 5mm stone in upper and 3mm stone in middle and 4 mm stone in lower kidney. am worrying a lot because we are planning for pregnency. please let me know the treatment. and tell me whether it will be problem if am pregnent with kidney stones?