Discharge? Urine?

Ok I'm 16 weeks and 1 day yesterday I felt a gush of fluid went to the Er last night they didnt do anything so my Ob had me come in today they Did the strip test and it was negative and told me my cervix was closed they gave me a ultrasound to check the fluid but babys heart beat was good and strong 150s I wont get the results of the ultrasound till tomorrow has anyone else experienced this and everything been ok? Baby was low

When doing the ultrasound they was right on or right above my pelvic bone is it possible for strips to be negative and still leaking fluid?