Sperm leaking, anyone else?

Kate
Today is my ovulation day and my first month ttc number two! My SO and I BD this afternoon and he finished while I was on top..when I got off of him a nickel size glob of his sperm came right out of me! Does this mean I've missed my chance this month? I'm bummed it happened and now I'm thinking that it means this month will be a no go. Anyone have input or experiences with this? If nothing else I wanna know I'm not alone lol!