The regurge likely happened due in part to the temps not being quite high enough to digest over the past few days, combined with feeding on day four. FWIW I feed my babies that age every seven days, mainly for my convenience so they're on the same schedule as my adults, and they're just fine.
A regurge is pretty hard on their systems. You should hold off feeding yours again for at least two weeks, and the next feeder should be a size smaller than what you're feeding now, so offer a rat fuzzy.
In the meantime pick up some of this - http://beanfarm.com/product_info.php...oducts_id=5933 - it's a probiotic for reptiles. When snakes regurge they lose a lot of their good gut flora, this will help put it back. Dust the feeder with a small amount of it. I feed f/t wet, and the NutriBAC sticks to the wet feeder.
If the rat fuzzy in two weeks stays down, offer another or a small pup seven days later, and again dust the feeder with the NutriBAC.
If that feeding goes ok then offer a pup as usual every seven days.