I had an abortion in November 2010 and it is presently March 2011. I did not bleed after the procedure and had an extremely light period almost 2 months later. The next period was a week late and was only brown spotting. This month was on time, but is again only brown spotting. I have taken 2 pregnancy test and both came with negative results. I've had an abortion before and began getting my period normally the following month. What is going on? Is this normal? If not, what is causing it?