V.W.
J.,
Going off memory here, I think it is 4 days in the fridge prior to freezing, and after freezing and then thaw, use within 24 hours. But I wouldn't wait that long!!! Milk gets so gross so fast. I just pumped for my daughter and an adopted niece this summer and here's how I would do it...
Pump into the nice freezer bags that are specifically for breastmilk, label, and freeze! Easy! Oh and I'd set one aside just for my baby in the fridge for her midnight feeding. You should be pumping a lot more than I, at two weeks for your baby. I was pumping twice a day and I still was generating 40 ounces in just those two pumps.
Look at your breastpump's instructions, most of them (at least the ones that I've had) have instructions and they are very strictly made by the FDA, since breastmilk is a FOOD... and follow those! Also, you could contact your local leche league and get advice there!
V.