I Had A Unprotected Sex With Mi Bf.. I Lost

i had a unprotected sex with mi bf.. i lost mi virginity for the first tym.. some blood also came ... bt during sex he has given out all his sperms out..v r sure..bt the thing is.is there any chances that pre cum can cause the pregnancy???? i also consulted to doctor..she asked me to take 2 ipill tablets ...nw its being 24 hours.. bt im feeling nothing ..lyk.. no vomit.no bleeding... nw i should wait fr mi periods or what????