Sore boobs?

I have never had sore boobs. I got off of the pill November of last year, and we have been TTC ever since. Months have passed and I've never felt sore boobs before until this month! Usually my nipples begin to hurt around ovulation but this month everything hurts, especially the sides of my boobs. My cycles have been very irregular since coming off of the pill so I think I may have ovulated around the 8th, but I'm not 100% sure. I haven't been using opk's anymore as they only stress me out. Any ideas? Could this be my month, after one year TTC?