I go on a hen do in 5 weeks and I am expressing and freezing. Doing quite well too, or so I thought. Hubby has just told me his friend (female) has suggested a particular formula that is good as a supplement while I'm away. I'm only going for one night. Not sure how I feel about this. I'd like to think he's being prepared for a backup but I'm worried this is the slippery slope to the end of ebf. what should I do?