If a girl and boy have sex i put his thing inside her but he didn't cum in her can she get pregnant what r the chances 0 to a 100?

Low risk: According to May Clinic reports, 28 out of 100 couples that use the "pull out" method will be pregnant in 1 year. Assuming that couples have regular sex several times a week, or 150 times a year, that reduces each chance , but the odds are still too high if you want to avoid a pregnancy, and gives no protection against transmission of infection, which can occur with one episode.