Sudden aversion to breastfeeding (16 months)

The last few days I am finding myself not wanting to nurse. My 16m olds latch is the same. No new teeth or anything...but all the sudden nursing is super uncomfortable. Is this normal? I really want to let him wean naturally on his own time (not mine!) and up until a few days ago I had zero desire to push him in that direction.

My mom said nursing aversion was her first sign that she was pregnant 😅. Anyone else have that experience?