Mama, stomach pain at 36 weeks combined with a lot of baby movement, please contact your OB or go to the clinic/hospital to get checked, okay? Hindi kami dapat mag-assume kung natural lang yan or something else. A few of us mums have gone through similar worries, at ang peace of mind from a quick check-up is really worth it, lalo na kalapit na ang due date mo. Better safe talaga, no? Let me know how you go!