That seems to be interesting , but I have not found that to be true for me at least!!! I use tampons, and have had 3 pregnancies, and still had IBS-D during all the times. That seems to be good investigation work, but in MY case it doesn't hold true. PS: I also have my cousin, who has had IBS-D and I asked her, and she has not noticed that her IBS-D got better while she was pregnant, and she has had 4 children.