So my Girlfriend's last period was on April 20, 2013 and we were fooling around on May 11, 2013. We were both naked and there was unprotected (no condom) genital contact. However, there was no penetration of the vagina (no intercourse) and no ejaculation what so ever. I do suspect there was precum that may/may not have had contact witht he vulva/vagina. After this incident, my girlfriend did take Plan B within the 24-28 hour period. I'm just worried and would like to know how likely pregnancy is from this case?