Hi,
Yes, it does happen, as each one is different and so are the experiences. Freemie did work well for me but then my SIL did not find it good enough when her baby was born. I guess, there is no harm in trying more rounds and it sometimes happens that we miss on doing something and it did not turn out well. But if it doesn't you can hand express if the supply is good.
Yes, I do not think there should be any problem in keeping the unwashed pumps in fridge and reusing them.
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Mum of LittleTwinStars