Ay alam ko yan feeling, nangyari din sakin around that time! Parang may intestinal movements lang kahit wala naman, and honestly maraming kaibigan ko na naranasan din yan, it's usually just your organs shifting around as baby grows, lalo na ngayon at 5 months ka na. But since you're already worried about it, best check with your OB just to be safe, kasi mas matutulog ka ng mahimbing if doc says it's all good, yun?