Sanitation Time

So I've had my DivaCup for one cycle now, and I have to say it was pretty successful! yay! My cycle ended like 3 and a half weeks ago and I've only ever rinsed it with warm water and stored it in the little baggy it came with.

So my question is, is it wrong to do that? Do I have to sanitize (via boiled water, etc.) RIGHT after my cycle ends? Or can I do that sometime before the next one starts? I'd been meaning to do it right after, but boy does time fly and little things like this slip my mind.

TIA!