Danni, I can almost guarantee that when you are in labour it will be almost the last thing on your mind. Having said that, I can understand your concern with IBS.

In the final stages of labour, when I was pushing, I was so in tune with my body that I felt like there was a little poo coming out, and I told the midwife exactly that, and she said no, that is just the baby moving down. But I was adamant, no midwife (however good she was!) was gonna tell me what my body was doing. I was persistent, I just wanted to warn her that I was going to poo. She didnt believe me until it came out. I never even saw it but it felt very small and looking back it is a funny, amazing story that I was so in tune with my bodily functions even during such a painful time!