I had unprotected sex with my boyfriend a few times. I thought I was getting my period Sunday night but it was more brown then red so I put a tampon in. When I woke up Monday morning I took it out and it was pretty much clean. Leaving the tampon out I went to work and that night at 5 the same thing happened with the brownish stuff and again I’m very confused as to what is happening. Is this implantation bleeding? Each time it has been like a brown or a pink and not red like a normal period.I want to know how long does implantation bleeding lasts and how it is different from normal period?