Can I get pregnant from precum if it’s on his fingers (not a lot at all maybe a drop)

So my boyfriend fingers me because I don’t want to have sex. Amherst always washes his hands but I’m scared he has stuff on his hands. My period is due in 13 days but my nipples feel sore and I don’t know if it’s because I’ve been doing physical labor around the house or what. Someone please lmk and help relax me!