Sometimes pregnancy can trigger IBS symptoms. Trust me, I spent most of my 1st trimester freaking out, thinking I was going to lose my baby. But it is just the IBS flaring up because of the hormones. I mean, I would wake up in the middle of the night with brutal cramps, thinking I was having a miscarriage, and it ended up being the other, thank God. Tell your doctor about it. Mine was not concerned at all. Just make sure you are drinking lots of fluids.