Milk mixing question

Dominique • Happily expecting baby #2😊
So if you're power pumping to build your supply and doing so for say 20 mins ever hour or every other hour, is it safe to mix the milk from seperate sessions? For instance if you pump once and only get an ounce and then get another ounce an hour later is ot safe to mix those ounce together to make two ounces? Or is that a no-no..