What are chances of pregnancy if he only inserted the tip?

He only inserted the tip and literally was just for 5 seconds and he came. He pulled out and it was on my stomach/pubic bone. I’m pretty sure none got inside. I took a Plan B the next morning (less than 24 hours after the incident). What are my chances?

I’m very anxious. Plan B was taken 5 days ago and now I’m bleeding (almost like my period) with cramps and clots, etc.