kidney stone advice

I've been dealing with a lot of pain for 2 weeks now finally my dr ordered me a urine test which showed 2+ for blood in my urine. Talking to my dr today she believes I had a kidney stone but possibly passed it because Saturday and Sunday of last week I was finding blood in my undies but none since. Today I'm starting to get that same cramping feeling along with brown blood in the upper part of my undies. Idk what to do. I'm 24 weeks pregnant