Feeling off for 2 days. What to do?

Charity • 25 💕 Harley’s mommy💕 married 💍 9/26/2020

Im 37 weeks and 4 days and for the past 2 days ive been feeling off, today the most. Yesterday i woke up having cramps that lasted for about 3 hours amd didnt really have an appetite. Today i woke up with lower back pain and it went away after an hour, the baby hasnt really moved much today either and my stomach and pelvic just feels odd. Idk how to explain it. What could it be? And should i get checked out just in case?