Lower tummy pain

Lisa • Mom of 4 boys and one baby girl. Mom of a high-school graduate, preschooler in heaven, 3 year old twins and a 1 year old princess.
So I woke up this morning and my lower belly is soft and hurts on the right side. I go to the dr tomorrow so I'm really not worried about it and babies are both moving. I'm wondering if baby A has flipped to transverse, or my uterus is just getting higher, or maybe just have an elbow in an uncomfortable place? Has anyone else suddenly had this type of pain and know what it is?