Shortness of breath ladies?

Ak
I know many here have gotten BFP:) congrats
I'm 9 DPO it' was 10:38 pm and I was sitting down when I had a hard time getting a descent breath in all of a sudden. It felt almost like a weight on my chest but not it was very odd I couldn't get a deep breath without struggle . It went away but it's coming and going 
My back has been bothering me
I'm gassy
Tired
Irritatable 
Chest is achy here and there 
Going to bathroom and feeling some pressure in uterus
Please comment