Hello, If you are pregnant for the first time, you cannot differentiate between fetal movements and abdominal tightening easily enough at this early stage. Also, you could be suffering from gastro-intestinal symptoms. Please get a proper evaluation by your health care provider and get treated. Constipation and gastritis if present should be treated with antacids, stool softeners and a healthy bland diet with adequate liquids. A sonogram of the abdomen also should be performed to check the fetal well-being. Hope this helps.