Girls, the further along in my pregnancy, the more questions )) ? I re…

Girls, the further along in my pregnancy, the more questions )) ? I recently read that if you lie/sleep on your back, the baby's oxygen will get cut off. Is that true? Yesterday the baby was kicking so much, in the evening when I went to sleep I lay on my side, woke up on my back ? Lying on my back has been so comfortable lately And there's not much movement today ?