My nut was drippin/runnin down my leg for no reason, my boyfriend said he cant hve kids bt could i be pregnant?

Could be either and std or pregnancy...you should always use condoms to protect against both regardless of what your boyfriend says. I know people who have kids when one person swore up and down they couldn't have them. Go to a doctor asap and get tested for std's and pregnancy. Good luck and if you end up with neither always use condoms!