The condom slipped off when he pulled out but the open end remained outside your vagina you pulled it out and ejaculate fluid was inside condom could you be pregnant?

If the cum is fully inside the condom, then no. But if the open end went inside then you took it out, or some cum got it awhile you pulled it out, and septed around the condom, then yes you could possibly be pregnant. If you're really that concerned, go to the pharmacy and get an over the counter birth control pill called the "day after pill." It will help stop the chances of pregnancy the sooner you take it. It is about 50$.