Thanks for the query.
According to your description there is possibility for urinary tract infection
Which can present with pain in lower abdomen, frequency and/or urgency of urination etc.
Some amount of diuresis is common in pregnancy
but when it is associated with urinary tract infection that may get more severe.
You should not stop drinking water in nights as that can affect you hydration which can further affect the status of liquor.
So you consult your gynecologist and undergo urine microscopy and culture and sensitivity which will detect the possibility of infection and also the causative organisms.
Depending on the result treatment can be taken.