Me and my boyfriend were performing manual sex, and he ejaculated on his stomach and his left hand. He wiped it all off with a paper towel. Then he put part of his thumb in my vagina from his right hand. He's pretty sure he didn't touch any of it with his right hand. I also went and got the Plan B pill after about 3-4 hours and took it. I also washed out the part he touched with soap, water, and benzoyl peroxide. My period ended about 2 days ago as well. What is the chance of me getting pregnant?