Could this have been Implantation Bleeding?

Hey Ladies - My DH and I have been trying unsuccessfully for about 2 1/2 years to get pregnant. We were on fertility meds for about 6 months last year with no +'s. We stopped trying in December of last year, I stopped charting ovulation and my BBTs and we have just been having fun, and , whenever we want. My LMP was the around the 30th of may. DH and I BD the 12th and then sometimes around the 18th, 3 nights in a row. TMI HERE - Friday I noticed some light brown discharge when I wiped, but it only happened one time when I wiped that day. Same thing on saturday and sunday, one time when I wiped there was light brown discharge. I figured on Friday it was the start of my period so I put a tampon in and about 4 hours later I took it out and there was nothing at all on it. Not even a spot. I was wondering if this could have been implantation bleeding as I haven't had any discharge on my panties or any other time besides for those three separate occasions...Thanks girls!! Baby dust to all you TTCers! ****************************************…