It is completely normal to not feel any baby movement at 3 months of pregnancy. Most women start feeling their baby's movements between 18-25 weeks. The size of your stomach can vary from person to person, and it is common for some women to have a smaller bump during the early stages of pregnancy. Factors such as the position of the uterus, abdominal muscles, and body shape can contribute to this. As your pregnancy progresses, your bump will gradually become more noticeable. If you are concerned about the lack of movement or the size of your bump, it is always best to consult with your healthcare provider for reassurance and guidance. They can perform an ultrasound or listen to the baby's heartbeat to ensure everything is progressing normally.