Awkward question...

Alright well I know it's natural for one boob to be slightly bigger than the other. My right one has always been a little bigger than my left. But, it felt like overnight my right boob got significantly bigger. I mean another cup size bigger. My left boob is still the same size so it just looks awkward! Is that normal? Is it because I'm taking prenatal pills to prepare for pregnancy? It doesn't hurt at all and there's no discharge. I've been going crazy looking it up on the internet. I was wondering if there's any recommendations or if I show grow some balls and go to the doctors... Thank you!