Breasts sore? Please advise

Alexx
Hello lovely ladies! I've been on birth control for 9 weeks now and have been having normal periods (slightly lighter and less painful than before BC.) 
The other day, my guy asked me if my breasts had gotten bigger. I hadn't noticed any change so I said no, don't think so. Now my breasts are noticeably sore and I do think they look puffy around the nipple areas. 
Is it normal to have sore breasts this late after starting BC? This is the second week of my third pack. Please advise me! Thank you 😊 

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