Don't worry I had a cups my whole life lol n they barely got any bigger when pregnant but after I delivered my boobs were like basketballs. I breastfeed. You'll be ok.
When Your boobs Grow Dramatically And fast That's Actually What causes Saggy boobies Later on. Be thankful they aren't too big. However they actually tend to get much bigger after pregnancy cause of the milk and also everyone is dofferent. My boobs had to be the first thing that changed in my body the first week of pregnancy they hurt and we're bigger. I Kept Growing My First Trimester, Grew One Cup And They Stayed That Way lol. Not to mention they're really dark now. But boobs so has nothing to do with how much milk you'll produce so no worries
I'm 16 weeks too! My breasts have gotten a little bigger but not huge.. I still wear the same bra as I always did.. my nipples are always hard and sore too..
Don't worry about milk supply, my boobs grew from the beginning but went up probably about 1 cup size or two once my milk came in the day after I delivered! Every women is different but boob size has no say on milk supply, so don't worry(:
Everyone's different. My breast started to grow seriously a week after I conceived, and killed with pain so bad, I'm 15 weeks and they are still bigger but don't hurt as much... It's hormonal, again everyone is different and Everyone's body is different don't worry about it :)