My breast is been hurting the past couples of days. I got a CT scan chest. 3 days ago but my period is also coming very soon. Is the pain related to my period coming or the CT scan on my chest? I got dye intravenous

Period-Related. Neither the ct scan nor the dye should have any effect on your breasts. As we like to say, common things happen most commonly: your pain is likely secondary to hormonal changes associated with your menstrual cycle.
Hormonal. At your age, the pain is likely hormonal and related to your period. Iv contrast is unlikely to cause delayed pain. If the pain persists or worsens, you should see your doctor.