so my bf was grabbing my chest and we both found a ball on the upper side of my left boob..
have you taken any breast feeding classes because that will also happen when you breast feed you can get a clogged milk duct and it become hard to where you have to break it down by massaging it
exactly what @naty199613 said. I've had a couple of lumps in my breasts this pregnancy too and they both went away.