How long does sperm live?

I was getting head and I had sperm on my hands, my hand was pretty much dry before I spit in my hand and touched my vagina. I immediately realized what I did and Washed my hands and vagina with unscented soap. <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> said I was 22% likely to get pregnant that day as well. Should I take a plan b ? Or am I trippin? Comment ‘ ‘plan b’ or ‘you trippin’.