Meeting needs

Ok. Baby girl is 8weeks today & eats about 3oz every 3 hours. I pump 6oz my first pump of the day & 3-4oz throughout the day. Basically I'm usually 1 feed ahead of her. This works for now as I'm producing exactly what she eats. As her appetite increases how will my supply increase to meet her needs. Or will I have to go to formula. Power pumping did nothing for me. I drink tons of water a day, oatmeal with flaxseed every also latches if I'm unable to pump