I had implantation bleeding with both of my pregnancies. Both times it was heavy enough that I was using regular size tampons. With my first pregnancy it lasted 5 days, and with my second pregnancy it lasted 8 days. The first day the bleeding stopped with both pregnancies, I was able to get a positive home pregnancy test. The way I knew it was implantation bleeding and not a period is it was a week before my period was due, instead of having my normal cramps I just felt "funny", and the bleeding (though enough for tampons) was not quite as heavy as my period and it seemed to come and go off and on each day.
at 12:54 PM on Mar. 23, 2009