He may not have regurgitated, but instead spat it out.
Sounds like he got the feeder partially down then something might have startled him into spitting it up, he thought it was too large, etc.
What's your prey size like? Any changes there?
Did anything change around the terrarium while you were gone, like other pets, loud noises?
If it doesn't look digested, it's most likely this was a spit-up vs a full regurge, especially if he was still feeling hungry.
Still, wait a week before feeding again.