Also suggesting that you wait. I had some trouble around week 20 with my rings fitting (the weather was warmer, so I'd have trouble with them on hot days). By week 24 I'd switched to silicone rings just to be safe. This is the set I bought: link
Bought it specifically for the silver colored ring.
Though this set looks nice, and if I had seen it first, I probably would have gone for it instead: link