Pregnancy without insertion?

Last nite my bf ejected cummed on the area above my clit while he was rubbing the back part of his penis on the clit and no insertion inside vagina....My last periods were 13 days ago....Is there a chance of pregnancy??When I stood up I felt liquid which I don`t know was his semen or my vaginal liquid in my vaginal hole and butt.I`m not sure if it was his semen or mine but the liquid was transparent.I rubbed it off with tissue then washed it off as well.If there is a chance of pregnancy then wat medicines should I take its barely 18 hours since that time?Please help