Mam and sir Me and my gf had unprotected sex on 2nd october (she took unwanter 72 )her last date was 9 sept ...but in oct she got her periods on 8 oct as expected ...still i was worried might she be pregrant so we checked beta hcg blood test after 20 days of intercource...and we got negative result ..now my question is if  her periods are late in nov .. month. should i get worried for pregancay as a reason for late periods  (beacuse she got her periods after 7 days after sex )or... i should relax and  remove the pregancy from the reasons for late periods in this case..(.as i got beta hcg blood test negative)...