There is no doubt that you should express your concern to the doctor. In some cases when discharge is tested after 12 hours since its large volume was noticed test can be negative if you really have ruptured membranes. Amnioscopy
could be performed to exclude this complication. There can be some changes in activity (usually hyperactivity) of your baby if you have ruptured membranes. So doppler investigation should be also done to examine blood circulation in placenta and fetus.
Wish you Good Health
Dr O. Aleksandrov