How do I know If I've gone up a cup size.
Answers: You should go find measured, any underwear shop will be able to do it.
Your breast can change size no thing what age you are, alot of the time due to diet.
If you don't wanna get measured then simply go and try on a B cup and see how i feels, but sometimes it's freshly the make of bra..
If it is the same brand and style as your dated ones, you probably have. If it's a new brand, or strange style, or both, then it may just be a difference contained by how it's made. Not all bra's are equal. You can still get bigger as you bring back older. Like someone else said, you can go to any store that sell underwear, and they can measure you. Good luck. If you don't fit into your old size than that medium your breasts have gotten larger. But you need to capture measured to find out how much they grew and what size bra you need to wear now. And yes you can still grow at 18..
If its sensation tight them i guess you should try a B on. Despite being 18 your breasts can and probably will keep growing for a moment or two longer.
I would suggest trying on a slightly larger bra and see how it feels. No harm contained by trying..
Yeah your breasts will always grow. I am an A cup to and I finally went up to a B after 2 years. The solely true way to find out is to let me have a feeling them. .
I Feel sorry for you your flat chested you keep growing your whole time so yeah its normal !