How likely is it to get pregnant if you didn't have sex but the man rubbed his penis on the inside of your vagina lips and did not cum?

Am I pregnant: Yes, it is very unlikely that you got pregnant from this experience. But, without knowing if he had precum on him or how far he got inside your labia i would not promise this 100%...

Unlikely, but possib: Pre-ejaculation fluid contains sperm as well - so it's theoretically possible, but unlikely. Since you're already pregnant i guess you've already discovered that unprotected sex is an excellent way to become pregnant.