Breast growth/tenderness is a common side effect from almost any type of birth control pills.

Unfortunately, birth control contains the same hormones that your body produces when you are pregnant so you can often have mimic pregnancy symptoms from this like the sore breasts that you are experiencing.

Have you thought about other methods of birth control that are non-hormonal such as certain IUDs or condoms? That would eliminate the sore breast side effect.

Thanks for your responses, I have considered trying a non-hormonal/Copper IUD but so far I haven't been gutsy enough to actually go through with it. I'm going to do a little more research before I decide to go that route. I am monogamous with my boyfriend of 8 years and we have used condoms in the past, but I don't even trust those very much. I have been using BC pills since I was 19, I just don't remember having this symptom go all month long in other years with BC pills, that's why this is so frustrating.

Thanks again very much!

Intrauterine device (IUD) is not recommended for young women who have never delivered but intent to do that in the future. IUD increases the risk for spreading the infection from vagina up into the uterus and oviducts which can cause very bad consequences upon fertilization ability in the future. This may not happen in your case because you have monogamous relationship but it you can never be sure. Beside increased risk for infection, another very common side effect from IUD is prolonged and heavier periods (menorrhagia).
Condom seems to be the most appropriate contraceptive method in your case.