I was so so scared of this. I didn't want DH to be in the room purely for this reason but at the same time I didn't want to prevent him from being there at the birth of our child so I never brought it up and left the choice up to him (without talking about the poop thing lol).
I think I pooped at least 3 times (although I hadn't eaten for at least 12 hrs+ lol!). Two of those times I actually felt it. And I was actually working AGAINST my body because I felt like I needed to take a poo. Then I actually said to the midwife "I feel I need to go to the bathroom..." and she said "go for it, it'll get better then"

and that's when I actually figured out how to push...and baby was out not 10-15 mins later...

and that's after they had discussed the possibility of vacuum at some point since I just "couldn't" push! If only I'd known! I'd have been trying to poop from the very beginning!
And DH, lol, poor DH! Later that day he said to me, "i didn't know that could happen," and I said, "er, yeah, I wasn't sure either,"

and that was the end of it