Hi. My period is 16 days late now. Me and my boyfriend did fool around a little bit (fingering and HJ) but no sex. He told me he might have gotten precum on his finger and fingered me. I'm really scared, could I be pregnant?

If he did have sperm on his finger when he fingered you, yes while it is a very small chance, there is a chance.
OF course it also could be various infections also, plus stress and other issues causing you to be late.

It is time to get a home pregnancy test and take one, use the first urine of the morning.