pain!!

A • engaged, nursing school, FTM to a baby boy 💙

I’m 37 weeks and 5 days and lastnight I woke up with excruciating pain in my right side under my ribs??? it’s sore and tender to the touch. It’s subsided a little but whenever I move in bed or get up I can feel it. What is it?? I have my 38 week checkup tomorrow so I will be asking but has anyone experienced this?