Is it maybe your bra pressing on a certain area, since both breasts have similar bruises and they may be more swollen than usual?
Just a thought.
KAT
Hi, Cassie,
Statistically, the chances of this being anything serious, especialy cancer are very low. However, there's no way to know for sure over the internet. Your concerns sound very much like they're hormonal, but the only way to know for sure is to get checked out by your doctor. He/she can put your mind at ease or order appropriate testing if there's any question. Here's a web site with some very good information about breast pain:
http://www.imaginis.com/breast-health/breast-pain.
However, your best source of information is your medical professional who knows your personal history, so please see your doctor.
Wishing you all the best,
nc