me & my gf had sex on 22-12-12 & she was having light bleeding as it was during period...used condom & im pretty much sure that i didn t *** inside her but,for more safety she took i pill within 48hrs...she used to had regular periods before but,now its about 5-6 days her periods are late..she didn t had any unusual bleeding after taking i-pill...is it normal?...on 18-01-13, Home Pregnancy Test came negative & that s good but,whats about the delay period?...how long it may delay?....should we see a doctor or check up?...we are tensed & going through a lot of stress ...Kindly need help