6 days after having unprotected sex I thought I had a late period but it lasted 1 day kinda heavy. The day before this "period" I had pink spotting. Then the folowing 2 days after the "period" I had pink spotting following pinkish brown spotting. Could this be implantation bleeding or was it a irregular period? I had a miscarriage 3 months prior to all this. Me and my boyfriend are trying to start a family but were very confused on what's going on. I also took a pregnancy test a week before it was negative and the day before this so called period I took a blood test and it was negative. Could it be negative because it was before implantation or was it just my period??