One breast produces “icky” milk?

I’ll have to manually express after baby goes to sleep but is there any specific reason one breast would produce “icky” milk? My daughter has shown a preference for my right boob in the last few days, but still switches sides occasionally. When she latches on my left, she’ll pull off and say “ucky mama” and wipe her tongue. I originally was thinking she kept getting hair in her mouth (I have long hair and it seems to be a common occurrence) but now I’m curious if it’s actually my breastmilk? She’ll be two in April, if that matters, I have an IUD so not pregnant and I don’t have a consistent (if at all) period/noticeable cycle.