Should I see a dr? Should I be worried?

My breast size has noticeably changed for me. 2 days ago my right one was bigger than my left, and when I "checked it out" it felt sore underneath and a bit to the right- but there where no lumps. Fast forward to today, my left boob is same sizeish, and my right is still sore when I touch it. I'm on the pill, and they shark bc if it. I exersize, I eat well, I'm just tired ATM and doing exersize like once a week bc I'm so worn out. I've put on a kilo in the last 3 months. Should I be worried?
Should I see a dr? Should I be worried?
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