Girls, I have a question. Sometimes it feels like squeezing and cramps…

Girls, I have a question. Sometimes it feels like squeezing and cramps in my lower abdomen, and sometimes my waist hurts. Is there any point in lying down for observation or just resting? By the way, I don't feel any contractions, my belly is soft, maybe the uterus is loosening or the baby is hitting nerve endings? 23 weeks pregnant.