I'll start off by saying I'm not vet.

Regurge can become a habit. A snake does not build stomach acid as quickly as we do and theirs is much more potent (we can't digest bones!) I would wait a minimum of two weeks before feeding a smaller meal (one small rat). On a bit of a side note, carpets are prone to obesity and feeding a medium rat is probably fine every week, but I usually suggest every 14 days or so. That's just some food for thought.