Any expecting mothers have a history of kidney stones before pregnancy?

I have a hx of kidney stones, passed my first at age 21 and 2nd at 28 I am 30 in a few weeks and am nervous about passing a stone while pregnant. I have several in my right and left kidneys just waiting to pass and unfortunately they are calcium stones. I understand that we absorb more calcium during pregnancy and also take prenatal which include calcium so I am quite concerned. Please share your experience! Thank you!!