Really sore nipples four days

Dee
I've had really sore nipples for about 4 days now. I supposedly have til the 28th before my period comes. I've had two days where I'd spot then one day without then two spotting days. This is my first month off of my birth control so I know I'm still adjust but this is getting annoying lol. I don't wear bras so it's really irritating having sore nipples