according to your symptoms, if you are pregnant for first time the pain may be because of dragging of round ligaments by enlarged uterus
, it is common as gestational age
increases. Normally uterus will be dextro rotated, so pain will be more on left side.
If you had pregnancy
with prior cesarean section the chances of adhesions will be there which will lead to dragging pain as uterus grows.
"But most important thing is you are telling that, you are passing gush of fluid from the vagina. It is most likely to be liquor if you are not confused with urine. This condition is called premature rupture of membranes
You have to visit your doctor 'immediately" and get checkup done including ultrasound
to rule out leaking of liquor. Delay may affect the condition of the baby and mother.