I'm 19 and i indulged in some sexual intimacy with my bf on 24th august , my periods ended on 23rd august. we didn't have intercourse and had our underpants on the whole time. I'm still a virgin and i was supposed to have my periods on 14th sept but its 15th and still there's no sign, also i'm having breast pain. could i be pregnant in this scenario and if yes then what should i do to eliminate pregnancy at the earliest? please help