Hello, my bf pulled out before ejaculating and the condom slipped off with about half of the condom was sticking out (rim was outside) and he imediately snatched it out if me ( within 1-2 secs of it happenin. is there a chance of pregnancy?

Possibly: There is always the chance of pregnancy when a barrier method of contraception does not work optimally. However, with the circumstances you describe, it would be a very low chance, probably 1-2% chance, of semen escaping (yes, there are semem present even if he didn't ejaculate). You can use emergency contraception with Plan B, or take your chances and wait things out....