I had my period on October 4th. It came on day 25 when I usually menstruate on the 27, sometimes 26. I had unprotected sex on October 11 (he pulled out). A week later on the 18, I experienced lighy brown discharge in my underwear. At one time my vagina contracted and pushed brown mucous out onto my underwear. This lasted for about 2-3 day maybe light 4. It is now November 1 and I still have not gotten my period. I do feel some cramping but am so worried that I'm not sure if it is pregnacy or period pain. Do you think I experienced implantation bleeding and am pregnant or it was ovulation bleeding and I am just stressing too much? When should I take a pregnancy test?