29 weeks with di di twin boys

Justice • Expecting Two Beautiful Twins ; June 2016. 💘👣 Loving this life.
One of my babies was dignosed with Velamantous cord insertion and here lately my baby on my left side ( not sure if he is the smaller one ) but he doesn't give me ANY movement I will go 6-10 hours and never feel him make a movement. My baby on the right side kicks very hard and is very active he never stops. Any advice? Should I contact my doctor? I go in the morning. 
Also anyone else have the velamantous cord insertion with one of there twins? I'm shook up about it. 
Thank you to anyone who replies! 

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