loss of circulation

Abrina • June 24th 2017 my beautiful baby boy was born Alijah Jay Kneeland I love you 💙👑
Im 13 weeks and ever since being pregnant i have noticed many nights that I will wake up with a numb feeling in my body from cut off circulation. Being that it is normal many times to lose blood circulation in your arms at night from sleeping on them I pushed this to the side not thinking anything was wrong but for the past few nights i have been woken in fear because of not being able to feel my neck or the right side of my face and head. Another night it was just my toes, what could be going on has anybody experienced this during pregnancy? 
Also: I know its not good to sleep on your back and I have not slept on it as far as im aware of