Had unprotected sex, pulled out. my girlfriend fell off a ladder from 2nd story the next day, doctors said it's an induced period, pregnancy chances?

Unlikely: First off, if you're not trying to have a baby, get a better birth control method. Use condoms or talk about using a hormonal method or copper iud. Second, really sorry for your girlfriend. That's terrible. If she's having vaginal bleeding and it's like a period, the likelihood of pregnancy is almost 0% unless she's already pregnant and further along, in which case she'd be at risk of miscarriage.