As pregnancy progresses, you may start feeling the baby bump on your right side when lying straight down. The exact timing can vary from woman to woman, but typically it becomes more noticeable around the second trimester. By this time, the uterus has grown and shifted upwards, making it easier to feel the baby's movements and position. However, every pregnancy is unique, so some women may experience this sensation earlier or later. It's important to remember that fetal movement patterns can also play a role in when you feel the baby bump on your right side. If you have any concerns about fetal positioning or lack of movement, it's always best to consult with your healthcare provider for personalized advice and reassurance.