There appear to be two variations on the definition of "conception." The Planned Parenthood video that I watched several months ago defines conception as the moment that the fertilized egg implants on the uterine wall. Based on this definition of conception, you could not possibly have yet conceived, as conception generally occurs six to twelve days past ovulation (DPO).
Regardless of whether or not your boyfriend fully inserted his penis into your vagina, and regardless of whether or not he ejaculated, it is possible for you to become pregnant. The only way to know is to have a blood test done by a doctor in about two weeks.
I think, however, that someone has recently read "Cradle and All" by James Patterson!