Birth control questions..breast tenderness

Selena
I have been taking my birth control for about 5 months now, I use to take birth control for 3 years but I stopped for 8 months and now I'm taking it again but for the past month or two my breast have been soooooo sore I can barely even wear a bra anymore and last month I didn't have a period but that has happened with this birth control before but never the breast tenderness, why now?