What is this? 😫

Last night I had painful cramps that felt like period cramps ALL NIGHT. My stomach wasn't tightening at all. So I'd assume this wasn't BH or real contractions. The pain was around my lower back and lower abdomen. Sometimes there would be a break in the cramping, but nothing I could time. I'm plenty hydrated and nothing would relieve the pain. They've stopped since I woke up this morning. I'm 39 weeks and this isn't the first time I've experienced this cramping, but this is the worst it's gotten.