My boyfriend went to the toilet, where he probably touched his penis and might have gotten precum on it. Then he washed his hands with soap, though I don't know how thoroughly. Then, maybe 20 minutes later, he fingered me. Could I be pregnant?
Absolutely not. It's nice to know that he washed his hands before fingering, thus reducing the chance of bacterial contamination. It's time for you to download a period tracker app so that you can become acquainted with the timing of your most fertile days and avoid unnecessary risks.
I agree. I like that you are responsible and concerned about not getting pregnant but this isn't how it happens. A period really needs to enter your vagina for pregnancy. Make sure any boy you are with is respectful and honor your body.