36 weeks gestation, admitted for anemia (hemoglobin 80), also moderate…

36 weeks gestation, admitted for anemia (hemoglobin 80), also moderate polyuria is being set. Today when I got up from bed, a little fluid leaked out of my legs, slightly soaked the socks. It was only once, then in the course of the day, half-daily urine output. How can I determine this?! Are they leaking water or is it the baby pressing on the urinary tract (by the way, the fetus is large)? Could it have happened to anyone else? The doctor will be on Monday, I want to ask to do a test for leakage of water or should I not worry? Did you reach the due date or did you give birth earlier?