Ahhh mamsh, loose bowel movements during pregnancy are actually pretty common dahil sa hormonal changes at ang prenatal vitamins, lalo na kung may iron content, pero tatlong times in one afternoon ay medyo madalas na! I'd really suggest checking with your OB just to make sure everything's okay, especially kung tuluy-tuloy pa, para hindi ka madehydrate at para ma-rule out any infection, you're doing great managing this kaya don't worry, pero better safe na lang! Keep drinking lots of water at eat light foods muna, and definitely let your doctor know sa next visit or sooner kung hindi umaayos. You're taking care of yourself and baby, and that's what matters most!