my boyfriend and I were in the shower (march 26th) which was also the last day of my period, i started to rub his penis and he then ejaculated and a little got on my hand, i cannot remember actually washing it off but i do remember making contact with the water with both of my hands. I then put vaginal wash on my hands and washed my vagina from the outside in. Even though we did not actually have sex I took plan b three days later (march 29th) just to be safe. Today (april 5th), marks a week since I have taken plan b and the only thing i have experienced is cramping, as if I am about to start my period. I should be starting my next period in 2-3 weeks. What are the chances of me getting pregnant from this situation? Thank you for your help in advanced!