It is completely normal to have a small baby bump at 15 weeks, especially if you are a first-time mom. Every woman's body is different, and the size of your bump can depend on various factors such as your body type, muscle tone, and the position of your uterus. As for weight gain, it is not uncommon to experience little or no weight gain during the first trimester. Many women start gaining weight later in their pregnancy. However, it's always a good idea to consult with your healthcare provider if you have any concerns about your baby's growth or overall health. They can provide personalized guidance based on your specific situation. Remember that every pregnancy is unique, and there is no one-size-fits-all answer when it comes to baby bumps and weight gain. Focus on maintaining a healthy lifestyle, eating nutritious foods, staying active (with your doctor's approval), and attending regular prenatal check-ups to ensure the well-being of both you and your baby.