It is important to monitor your baby's movements during pregnancy as they can indicate their well-being. If you haven't felt your baby move for an extended period, it is recommended to contact your healthcare provider for further evaluation. As for the stomach pains and fluctuations in size, there could be several potential causes. Gas and bloating are common during pregnancy due to hormonal changes that slow down digestion. However, if the pain is severe or persistent, it is advisable to consult with your doctor as it may indicate other issues such as round ligament pain or gastrointestinal problems. Your healthcare provider will be able to assess your specific situation and provide appropriate guidance and treatment if necessary.