I’ve been having the same the entire pregnancy and it’s continuing now! I have lactulose but ran out yesterday so dreading the days until I can get more😭
You may want to try magnesium in addition to a healthy diet. I have been taking one magnesium tablet a day and have had no issues since then.
Could be baby position if they’re putting a lot of pressure on your intestines, it’ll make it harder for you to pass :(