Ay sis, na-experience ko yan noong pregnant ako and honestly it freaked me out, kaya nag-check agad ako sa OB ko! It could be ligament pain, Braxton Hicks, or something else entirely, kaya please don't just brush it off, go see your doctor para ma-rule out anything serious, especially kung on and off pa lang at nag-worry ka na. Better safe than sorry talaga pag pregnancy stuff, no? Let me know what your doc says, pampalakas ng loob!