Girls, Sore breasts, but period is ending?

I got a really heavy period for the first time in a while, usually they were pretty mild. My boobs started to get sore about a week before, which is fairly normal.
But they still have soreness. I only feel this soreness when i touch my boobs. Like putting on a bra, I feel the soreness on by breast near my lower part of breast. It's nothing uncomfortable, at first I thought I pulled a muscle from weight lifting or something. But it hasn't gone away and my period is really heavy and I'm confused.
Help?
Girls, Sore breasts, but period is ending?
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