How likely is it possible to get pregnant from precum? is it possible at all?

Possible if: During your fertile period, no use birth control and condoms if you do not want to get pregnant.T as high as when he comes in you, .

Hard to give a %: But it's possible to conceive from only exposure to pre-ejaculatory fluid. There are plenty of sperm in pre-cum, and they are pretty tenacious. The "withdrawal method" has a failure rate of 4%-27% depending on how well he can control it. That means at least 4% of couples who are using the "pull out" method will get pregnant each year. (not a 4% chance each episode.).