I had my last period on 9-14 october. On 20th october i had unprotected sex with my b.f. and thuus taken ipill on 21st evening. On 27th i got bleeding which lasted for five days and today its 25th november, i havent got my period. i have taken 3 pregnancy test till november 23 and all shows negative result. can i be pregnant????? is there any chances of ecotopic pregnancy or STD?????????????please please help