I just started pumping yesterday to store up some milk so my hubby and I can go on a date for our anniversary. I just put the milk I expressed today in the fridge and looked at the stuff in the fridge from yesterday and it looks gross. It has a layer of like curdled looking stuff on top. Is this normal?? I smelled it and it smells totally fine. No smell at all really. Is there something wrong with it or does the milk just seperate like that??