Preterm labor?

I'm 31 weeks with baby three. I've had three different days within the past two weeks of really uncomfortable contractions... Like I feel them in my back, abdomen, and down my legs. I've had a lot of Braxton Hicks, too, which I only feel as tightening in my belly.

Should I worry about this???... Cuz I kinda am 🤷🏼‍♀️. I mean, it has since subsided... Does that mean I'm good??