Who else started Braxton Hicks at 24 weeks?

I’m panicking a bit. I’m trying not to and keep throwing it to the back of my mind but I had twins 3 years ago at 31 weeks gestation. So with this pregnancy, although it is a singleton, I’m still worried that I’ll go into premature labor given my past. I’m 24 weeks now, and I’ve been noticing that I’ll feel this sensation in my belly and when I press on it, it’s hard. It’s not painful but it comes and goes. It’s only been 1-2 times per day so far. Is this Braxton Hicks?

How long after Braxton Hicks started did you go into actual labor?