Breast changes

Mo

2nd pregnancy. My breasts have been “full” and “heavy” feeling since like 16wks. Like they feel when they are full of milk/firm. The last couple days they have gone back to being floppy and no longer firm. Is this normal or did my hormones change? Everything I read says your breasts get more firm and full as they prepare for milk to come in/birth in the 3rd trimester.