Early labor ??

So I’m having lower back pain periodically, It started out about 20 mins apart, but it’s gotten to 10-15mins apart. And it feels like someone is pushing the sides of my lower back in together to the middle for almost a minute, that’s my best explanation for what I’m feeling

My stomach has also been going rock hard then back to squishy every FEW minutes

The stomach cramping is uncomfortable but bearable

Stomach tightening every 4 mins

Do we think this is just Braxton hicks? I’m 36w