I separate my expectant moms to their own tubs but I do mostly pet rats, most people that do feeders only don't separate and do just fine.
Separating allows the moms to be stress free during their taking care of their babies and the babies don't get stolen from other moms and tend to be fatter and better fed in my experience.
Conversely the moms have litters further apart so you need more moms to produce the same amount of babies if you separate the females from their group.
4 days isn't a really long time but someone will need to feed and make sure they have water during your time away.
As long as your "teenager" makes sure they have water and food there shouldn't be any issue.
I would look into building an inexpensive rack so your rats don't get sick in tanks...
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