31weeks pregnant baby movements only on right!!!???

Currently 31weeks pregs baby has been highly active last night continuesly moving from 1:30am til 5/6am but only on the right side and today its moving on the right ive tried rubbing my stomach on the left so I can feel a kick or punch there but nothing!! Is this comcerning or worrying please anyone let me know this is my first baby and I was pregnant in 2013 but unfortunately lost my baby... this is the reason why now i get really concerned over little things!