So I'm 35 weeks and cannot breathe, I feel like shes right on my lungs. I've googled it and found a…

So I'm 35 weeks and cannot breathe, I feel like shes right on my lungs. I've googled it and found a few things about "lightening", where when she moves lower I'll be able to breathe again because she wont be right on my lungs. I asked my doctor about this and she just told me "no. that's not a thing, itll only get worse". Has anyone actually experience this lightening thing? Or is my doctor correct? I really hope shes not lol.