Why do they hurt so bad?!?!?!?!

Omayra

according to glow I ovulated on Saturday the 26. which would make today 4dpo. since this morning my nipples (not my breast) have been soo sore and sensitive. on top of that they seem to be harder then normal. anyone ever get this pain in the nipples only??? I need help they hurt so bad I can't even rub my hand against them because they HURT!!!!!!