I am feeling like gas filled inside the stomach and hard,push feels is this is normal in the time

Yes it may be because of bloating. Gas is very normal in pregnancy. Read these articles to get some relief Heartburn & Acidity During Pregnancy: Why Does it Happen And 3 Natural Remedies That Work!

Take some ajwain seeds and mix some black salt. Gulp it down with water gives relief.

Walk a little for some time dear

Yes it is common ..Nothing to worry