Hi, can anyone tell me if its normal for a kidney stone to grow 3 times its size in 4 weeks?

i have had ct scans and ultrasounds and x-rays and been told i had a stone that was 2mm that was four weeks ago after my gall bladder was removed, then 5 days ago i had another ct scan that said it was now 4mm and then today i was told it was 6mm on ct scans, should i be worried and i have had severe pain on and off for four weeks with the past 5 days in severe pain that only hot baths seem to relieve the terrible pain! also told the kidney stones has not budged since four weeks ago and still in same place,