Signs labor was near?

My due date is 28 days away but I was wondering what signs you ladies had before going into labor. Right now my body feels weird and off. As if I have no energy and my body is sore. It's very strange I'm just taking it easy.
Also I've made frequent trips to the bathroom and my back is very sore. 
I'm not looking to much into it just curious. I'm a first time mom so I'm not sure what to look for.