On lo loestrin fe birth control for 10 days.. had sex no condom, no ejaculate.. but maybe some pre ejaculate? how likely to get pregnant?

Possible: While the possibility sounds low, you really can't put a number on it. You could be pregnant because you had unprotected sex without full contraception being in place.There is no way to put a "how likely" on this. It comes down to you either are or are not. It only takes one egg and one sperm to create a pregnancy. If you don't want to be pregnant, follow the directions of your contraceptive fully