Is it normal to urinate during sex?

[BlueWonder]

Ok here goes... This is difficult to talk about but I am confused??? I am a single mother and I never had this happen but in the last 5 years of my sexual existence, i've had a few partners... Only one has made this happen and it was intense! So I already know that I have bladder weakness b/c the trampoline and exercising are not my friends. Occasionally when we are having sex, it feels amazing but a watery substance (womanly juices or pee) leaks out, leaving the bed soaked as well as me and my partner. It doesn't have an odor or color but there is so much of it I literally have to change the sheets. It embarrasses me and I am afraid I am peeing on my bed. I thought an orgasm was thicker? By the way I have had check ups and all is in good non-condemnable order. I haven't talked to a doctor about this problem (if it is one in fact). What to do???