my boyfriend and i were just having sex and some time towards the end the condom just barley came off, enough so that i could freely reach down and most of it was hanging out, it looked like the amount of 'cum' that he usually has was in the condom and it was a matter of seconds after he came that we realized this and i immediatly went and did a sort of make shift douch with clean water and then soapy water then clean again to rinse it out. i plan to get the morning after pill tomorow and i do not take birth control. Will this keep me from becoming pregnant?? i really need to know.