Hello Dr. I had sex with my partner right a day after last day of period on 26 Nov 2016, and gave unwanted 72 within 18 hrs, but her period is not arrived so far ,and did urine pregnancy test on 1 Jan 2017 shows negative result, again did on 2 Jan again shows negative ,test has done with early morning urine sample, I am very scared, is there chances of pregnancy, why period is not arriving, wht to do. No sign n symptoms has ever seen ,no implantation bleeding has seen. please suggest me wht to do.