Please help me. Pregnancy scare. Teen.

Hello ive come here frantically for help.

I have been giving my boyfriend handjobs but this time he got some precum on my fingers. I thought nothing of it.

20 minutes after touching the precum i decided to masterbate with the same fingers. And put the same fingers into my vaginal entrance. So the precum had been on my fingers for 20 minutes

Im scared that ill become pregnant from this..

What is my chance of pregnancy? Will I become pregnant from this?

Thank you for answering my questions.