I am on the pill and had my period as normal from November 26th until December 2nd. On the 5th of December I had sex. Then on the 8th of December I started to notice brown spotting. I only needed to wear a panty liner as it wasn't heavy. I stopped this spotting on 9th. I am due my next period on December 24th. Could the brown spotting be an implantation bleed? Can you get pregnant that soon after having a period? I thought it had to be when I ovulate?