I had unprotected sex at the end of November right after my period and on December 23 and maybe a few more times in between I don't quite remember I got my period on December 26 or 27. It lasted for 4 days where it usually lasts 5-6. The last day was really light. Yesterday and the day before I had a lot of brown discharge and nothing since then. I have studied all of the symptoms of pregnancy and I am experiencing almost all of them. But I had my period so I can't be pregnant can I? Should I take a test?