yesterday me n my gf were having a foreplay at the end of which i ejaculated on the bed,but some sperm touched her vagina..through her panty..though i havent yet broken her hymen,coz we never had sex,still i heard there are chances of pregnancy,so we went n got a contraceptive pill(unwanted 72) within 1 hour,my qzn is ,is it enough to stop pregnancy,n when shuld she expect her periodz ...will they be delayed or come earlier??? pls tell we are really worried!!