just my opinion, if you fed it at 9:30 pm and it regurged i would think you would still be able to see the pinky.
Also shedding is not a good time to feed. Although I do it at times. I have to be like that parent that says do as I say not as I do.
Poke around with the matter. you should be able to tell if a regurg. Also 6 months old and on pinkies? On that topic can you measure teh snake, and take a few good pictures so we can see the size. Growth does vary, and terms like "pinky" are loosely used. i have customers come in for pinkys, and I ask with fur? and they say yes, and eyes open and moving around. I try so hard to teach then proper terminolgy. But noooooooooooooooooo, they like their terms. OK ,,, I'm sorry, I had a pet shop flash back! lol
Take a few good pics for us to see. Also of the matter you have a question about.
Good luck.
Sorry for my attempt at humor. 
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Thanks for reading.
Big Tom
www.HerpZillA.com