unusual shape and color of lamictal/lamotrigene

I have been on lamictal/lomitrigine 200mg, for a number of years, and have always received the same looking pill,deep aquamarine blue, with six sides. My last prescription refill, the pills are round and light peach color. It has a midline for cutting in half, and the numbers 22 and 3 on it. The other side has the letters rds. I can't find this description anywhere. Does anyone know of this description?