Sudden urge to pee then wet myself!?

I was looking at something in a drawer and then suddenly I had the urge to pee and by the time I realized I needed to pee I had wet myself!? my boyfriend and I had just had sex a couple hours ago and he has a 10 inch cock so I don't know if it's because I'm loosend by him that I can't hold in my pee but I also took many vitamins this morning and this has never happened to me before! what should I do?