So I just started pumping today and got less than an ounce which I put into the fridge. I'm assuming I will pump tomorrow and get a similar amount. Since I'm only supposed to keep the milk in the fridhe for 48 hours tops, I assume I should transfer the measly 2 oz (ish) to the freezer after that. I'd like to store 4 oz total in a bag... Can I add to my frozen supply later with fresher milk as I continue to pump?