Clear fluid after sex

My boyfriend and I had unprotected sex. Yes I am on birth control. After I cleaned up and made assure his  sperm was gone. Then went to bed. I woke up feeling like I was peeing, felt my self and I was wet with clear fluid. It was not pee ( didn't smell like it) and wasnt sperm (it was too clear almost like water). My question is does anyone know what this could be?