Ay, totoo yan, maraming mga kaibigan ko na nag-experience ng ganyan during pregnancy, parang may sariling heartbeat yung belly mo kaya nakakaaliw at nakakaalarma at the same time! Kung tolerable lang at walang ibang symptoms like bleeding or severe cramping, usually okay lang yan, pero I'd still suggest mentioning it sa OB mo sa next check-up para sure, lalo na kung first time mo or if nagbago yung pattern nito talaga.