Very small increase in risk.

The resulting 15-year “excess risk” associated with five years of use of combined or progestagen-only contraceptives in high-income countries was estimated at 8 per 100,000 users ages 16 to 20 and 265 per 100,000 users ages 35 to 39.

https://edition.cnn.com/2023/03/21/health/hormonal-contraception-breast-cancer/index.html