I had unprotected sex on Oct 6th. my last period started 25th Sep. I am kind of in middle of my cycle. He finished everything inside and I took Plan B One pill with in 2 hours. I got little cramping and Diarrhea next 3 days. My expected period 22nd Oct and I started my period on 18th Oct (5 days early). It's one day longer than I usually get and its a normal period.
I took Pregnancy test 23rd Oct (18 days from risk) and got Negative.
I took Blood test on 30th Oct (25 days from risk) and it came out Negative.

My question is what are the chances of being pregnant? Am I clear from Pregnancy?
We didn't have SEX after 6th of Oct.

Its really a big lession for me and I need your help.