Hi there, thank you for posting your question on Ehealthforum. Please remember that this is not intended as a substitute to visiting your own doctor. If you are worried about your health, talk to your doctor.
To answer your question briefly, it is not possible to get water trapped in your uterus. Your watery vaginal discharge could be tricamonis and you need to have this checked out.
Dr Andrew Rynne.
www.andrewrynne.com