sore breasts?

I'm only 2-3dpo, and trying VERY hard not to symptom spot. BUT... I always have sore breasts the day of O, and then it goes away within a day or two. Woke up this morning and had ZERO breast tenderness. Then around 4pm today, they got really sore again. Like REALLY sore. I realize that it's caused by an increase in progesterone, but I've never had it come back after disappearing. Thoughts?