Hello, I'am 22 years old, no chance of pregnancy (as I have a girlfriend), have been on my period now for 4 months, I'am supposed to get a endometrial biopsy done soon, but I have noticed lately that my right nipple is extremely sore to even brush up against, I'am wondering what this could be and what I can do about the pain? Someone please help, and its only my right nipple, my left is perfectly fine!