I am 21 weeks pregnant and everytime my boyfriend and I have sex and I am on top, I urinate. I have found this does not happen when I am not on top. I feel that I have to pee with all the pressure, but that's the same feeling I've always had nearing an orgasm. I don't feel myself urinating, but I know when there is alot of fluid and it also smells like urine, that I urinated. I just wanted to know if it were normal or if I should ask a doctor.