35 weeks and a TMIquestion...

TMI but when I have been going to the bathroom and push for a bowel movement I have pressure down in my vag. It’s hard to explain but it kind of feels like my muscles inside are sore. No burning or irritation, was checked for a UTI and BV at my last appointment and both are negative. It’s not painful but it’s just weird and uncomfortable so when I have the urge to go to the bathroom I dread going. Anyone else have this?