i had sex on 22 october 2015 and den i got my menses on november 4 it was normal periods with normal flow how i use to get every month and now its december n i am a week late on my period i hav no symptons like tender breasts or vomitting i jus had cramps and gases . is there any chances of pregnancy ? i am very tensed i tuk a pregnancy test to early mornin it was negative but i am not getting my period ?