Hope the constipation settles, it must be horrid.

As with pushing for the baby, yes it feels like you are going to push the baby out of your bottom, but i don't think it felt at all like straining to pass a bowel movement, it is an uncontrolable push that takes over everything and you (well i did) use your entire body to push. So no i don't think it is at all like straining for a poo, but obviously everyone is different.