Uy, that stomach pain when you move or exert yourself ay normal sa pregnancy, lalo na if you're in your second or third trimester, it's usually just your ligaments stretching or Braxton Hicks contractions, pero better to check with your OB just to be safe kasi first time mo lang! A few of us moms noticed the same thing, and our doctors said it's okay as long as walang bleeding or severe cramping, pero palaging mas maayos kung may peace of mind ka from your doctor mismo.