Ohh I totally get this, breathing issues memang common towards the end of pregnancy, especially bila dah penat sikit! A few of my mum friends had the same thing, usually sebab baby dah besar and pressing on everything lah. Still, I'd suggest you mention it to your doctor or midwife next visit just to make sure everything's okay and get some tips on what's normal vs when to be worried, especially since you're due quite soon!