I literally can't breathe.....

I have shortness of breath. I'm 26+4, and there's some moments where I literally can't breathe and it freaks me the hell out. It scares me... I have to take DEEP DEEP breaths to get my normal breathing back and this happens atleast twice a day.. should I be concerned or is this just a normal thing due to the baby's growth and organs moving around? I'm obviously going to tell my doctor the next time I go because it concerns me. I was just going to see if this happens to anyone else and if your doctor has suggested any kind of advice!?