Me and my partner had unprotected sex last January 25. It was my last day of period and I'm supposed to be having my menstruation these past few days. On February 25 I noticed these tiny drops of blood and it was kind of normal for me since I thought it was my first day and eventually expected to have a normal amount of red blood loss on the second day but it didn't happen. These tiny drops of brown blood lasted for roughly 4 days and nothing heavy had occur. I only could find brownish stains on my underwear and I'm afraid this could mean that I got pregnant even though it's quite impossible because implantation bleeding occurs 6-12 days after the intercourse.