Any of you that have had implantation bleeding how long did it last? How heavy can it be. My normal periods are usually 8-10 days long and very heavy during the middle of those days. This last period I had was 2 days early and only lasted 4 days and I only needed a panty liner every day and it was just a little bit of brown spotting. I didn't see any uterine lining which I see a lot during a normal period BUT when I had sex with my boyfriend I bled quite a bit and it was the first of red blood that I've seen the whole time and then after I stopped bleeding completely and my "period" ended. (He doesn't mind sex on my period) I'm not on birth control or any kind of medicine. I was wondering if this could possibly be implantation bleeding. This has just been in the back of my mind and I'm not sure if I should make a trip to buy a test or not or if I just got lucky and had an easy period and I'm just being paranoid.