breast pain

I recently worked out with weights about a week ago for 20 minutes and ever since then, my breasts have been sore, very very sore. My nipples are even sore. Is this due to overexhilerating myself? I don't regularly work out with weights so I just thought this would be why they(breasts)are so sore. But, would this cause my nipples to be sore? I am also on birth control because I have severe cramps and slight endimetriosis. I am supposed to start my period next week. My concern is cancer. My mother had it and my grandmother and so on, down the line. Can you shed some light on this subject?

[CCF-RN,MSN-JS]

Dear Yesnylyerg, Breast pain is a common breast symptom.  The reason for breast pain is not clearly understood, and is not usually associated with breast cancer.  Sometimes it is associated with hormonal variations and is called cyclical breast pain.  The pain you are experiencing may be in part due to soreness of the pectoral muscles (located under the breast) which may have been overworked.

Regarding your risk for developing breast cancer; the determination of a person