Weird question lol

So I'm 17 almost 18 weeks. My belly isn't big but I'm def starting to feel a more heavier/pressure feeling in my lower abdomen. My question is, is it common to feel like you lose your ability to push to have a bowel movement ? Lol...I just feel like I can't push as well as I use to! It's so weird. I'm posting as anonymous bc I feel like I always have gross questions 😜