Even more confused....

so I had a d&c; after my missed miscarriage on July 12th. I have had unprotected sex starting 2 weeks post d&c; until now almost everyday, sometimes every other day. but I had pink and brown spotting on the 12th after having sex with my hubby and I thought it was my period trying to start again so I put a pad on. and it stopped and nothing since ( no cramping nothing). I've never bled during implantation in my other pregnancies. and I have never bled after sex normally. that was the first time anything like that has happened. was my period trying to start and it just didn't happen? was that a possible implantation? I'm super confused lol ... any suggestions?