It is generally safe to consume Sprite or 7UP in moderation during pregnancy, including at 16 weeks. These carbonated beverages can sometimes provide temporary relief from digestion problems such as nausea, bloating, and indigestion. However, it is important to note that excessive consumption of sugary drinks may lead to weight gain and other health issues. It is recommended to opt for healthier alternatives like ginger ale, herbal teas (such as peppermint or chamomile), or plain water with lemon slices. Additionally, maintaining a balanced diet rich in fiber, fruits, vegetables, and whole grains can help improve digestion naturally. If your digestion problems persist or worsen, it is advisable to consult with your healthcare provider for personalized advice and guidance.