Sore nipples...

Only been TTC for a couple weeks as I ended my cycle in the 11th of this month. My period is due in abt a wk and half but today my nipples are tender. Like tender enough to hurt slightly. Normally when AF comes, my breasts hurt in general but not jus my nipples.  Anyone else have this happen. I figure it's jus my body adjusting to stopping the pill (stopped nov 7) but finished the entire pack