Anybody else?

Arianna • Mommy to a beautiful baby boy 💙Jaxson Cobain Hanson 💙 11/12/18

I'm 22w3d now, but this has been going on for awhile. Every so often one, or sometimes both of my nipples get SUPER hard and it actually hurts. Like I can feel them stretching. Then within a couple minutes they just go back to being normal. Does this happen to anyone else? And why does it happen?