I have a small amount of bm in my fridge (collected in a breast shell), which has been there since Tuesday, was planning on expressing some to add to it but didn't get around to it, and was out all day yesterday. So, can I add more to it today to get a decent batch for freezing, or have I left it too long and need to chuck it out? Only about 1/2 oz so not too much of a waste if I do.