Round ligament pain or Braxton Hicks?

I’m 22 weeks pregnant this is my 3rd pregnancy (first pregnancy successful, 2nd was a miscarriage).

I have back pain everyday but it’s getting worse. Last night at 3AM all of a sudden i had cramps that was on going & a pain with it. My lower belly had a warm feeling every time it cramped & i felt the pain in my pelvic bone. It hurt to walk or even move. I had the feeling that I had to do a bowel movement my tummy felt upset. It lasted for minutes but then stopped but came back. I didn’t sleep until 4-5AM. If Braxton Hicks do I tell my OB.??

Thank you ladies❤️