I doubt there's anybody on this forum who hasn't missed noticing a shed cycle, especially when new to the hobby or with light colored snakes. After you've had yours a while, you'll get better at noticing the signs, even if they're subtle. Like Nanci said, don't ever feed this one in blue again. Some handle food fine then, some regurge every time. Given the rough going so far, it's best to err on the side of caution.
Hopefully your baby will be well. Just don't rush things, get the Nutribac ASAP, and follow regurge protocol carefully. (That includes no handling during the 10-day rest period.) Best of luck, and keep us posted.