One boob bigger then other but was other way around?

[MaKa_newbie]

Hey girls! Just a random question as it hasn't happen to me before. 😅
So as we all know every girl has one boobs slightly bigger then the other one. In my case it was always my left boob. Sometimes I get swollen boobs before my period and it's not always like that. But for the past two months (15 days more or less) my left boobs id the same size as it was before but now my right boob is bigger. And probably bigger for a cup/two. It is tender just like before period and it's not going down. Has that happen to anyone else?
P. s. just for info i'm 23 and my boobs are same size for the past 8-9 years.

[petitedollbabee]

If you’ve gained weight, that could be the reason. My left boob is slightly bigger than my right, and gets very tender before my period. But I’ve noticed that while gaining weight, most of the weight goes into my breasts. If you think something abnormal is going on with your breasts, get them checked out by a medical professional. Doesn’t hurt to get checked for breast cancer if you’re worried.