Uy mama, please go to your OB or labor and delivery right away, hindi kami dapat mag-assume with tummy pain at 36 weeks, kailangan talagang i-check ng doctor mo if everything's okay. It's better to be safe, lalo na first time mo! Marami sa amin na-experience rin ang heaviness late pregnancy, pero ang pain combined with limited movement needs professional eyes talaga. Keep us posted, ha? Sending you strength!