Is this the effect of starting to enter a trance?

A quick question for you, my dears. I've been trying to enter a trance for some time now (almost a month). Today was probably a breakthrough, but I'd rather ask. I took deep breaths to quiet my mind, no thoughts, images, words. I felt such emptiness, a feeling of pressure in my chest and slight shortness of breath. And falling backwards. Is this how a trance begins? Or maybe I should change something in my work. What should I do next? Thank you, greetings.