In 19 years old. I had sex with my boyfriend & it was only for 3 sec unprotected but I'm sure he didn't cum. I am 10 days late on my period. My last period was 10/21-10/26. I expected my period on 11/21 but it is now 11/30. I don't feel any different at all. No pregnancy symptoms. None whatsoever. Took 4 pregnancy tests and they were negative. I took them 7 days after my missed period. I also had a brown spotting today 11/30 but idk what that means. I'm not trying to get pregnant. I usually eat very late (at 2pm or 1pm). Help please.