Has any pregnant woman or woman when pregnant felt like they where shitting out there baby's when…

Has any pregnant woman or woman when pregnant felt like they where shitting out there baby's when simply trying to poop? I ask this bc I keep trying to poop but it isn't working to good, it's only like tiny and it hurts a lot... I am 21 weeks pregnant with my first baby and maybe that's just normal to feel like that when your pregnant but idk..