for a little under a week now, i've noticed that both of my nipples feel really sore when they are pinched. i've had this feeling before but i don't remember it lasting for more than a few days. my right one is starting to feel better, but my left one is still pretty sensitive, and it could just be my paranoia but the left one also looks a little bit red right where the ducts would be if i had to guess. i've been on birth control for about 4 years now so i don't know if that could have anything to do with it?