Thanks for your question! If you have questions or concerns about having this conversation, talk with your doctor. The discharge may be on just one side or from both breasts. Some girls are excited about their budding breasts and new training bras; others may worry that all eyes are focused on their breasts. It is perfectly normal for each of a woman's two breasts to grow at different rates.
This helped me a lot.
Do breasts hurt when they grow?