Kidney stones?

Okay so this might be kind of lengthy. I apologize. For the past week I've had an increased urgency to pee (especially at night) and it's been bright yellow. I rarely drink much water, or much of anything so a random increase at night prompted me to take a pregnancy test. While I was peeing in the cup for the test, I caught two ant sized black stones. No pain what so ever. I googled & of course it told me cancer. I called the nurses line for my insurance and they referred me to my medical clinic. My doctor told me that since I'm not having pain I don't need to be seen & to just uptake my water intake and to go in if I start feeling pain or see more stones. He said that sometimes stones can pass without pain. I'm a little freaked out, I know "doctors know best" but in this case I feel like I need to be seen. I've never heard of kidney stones passing painlessly?