What did your contractions feel like when they first started?

I am 39 weeks tomorrow. I’ve been 4cm and 90% effaced for a week now. I was checked today and I’m still the same. However, I am starting to feel what I thought were Braxton Hicks. But they’re coming frequently, and whenever I get them, my stomach gets really tight and then I feel lots of cramping either in my back and/or in my lower abdomen. I’m wondering if this will progress 🤞🏻🤞🏻🤞🏻