It's kindly of normal during pregnancy when ut happens once a while. Try making the changes in your routine that I have mentioned above . See if that works for you

It could be bloating after your dinner .try taking small meal, drink plenty of water , walk for a few mins after meal , avoid fatty and fried foods in dinner . Also try this juice for bloating relief http://app.babychakra.com/feedpost/180696?ref=SEEM26882&

Is it normal?

In most cases, a tight stomach is caused by physical factors, such as digestive issues or hormonal changes. The feeling can also be caused by chronic stress. Stress reduction techniques, such as mindfulness, may be helpful in such cases I hope this helps

If your pregnant belly feels tight and heavy, it's usually because your uterus is expanding to accommodate your growing baby. As your uterus grows, it eventually pushes up against your abdominal wall, giving your belly that tight-as-a-drum look and feel. As your pregnancy progresses, it may be a sign of a possible miscarriage in the early weeks, premature labor if you aren't due yet, or impending labor. It can also be normal contractions that don't progress to labor.