Spotting instead of period

I realize there is nothing I can do about it right now I just feel like venting and maybe getting others opinions about this. I had some very very light spotting about a week or so before (this is normal for me) and then the day I was supposed to get my period I got spotting. (Not even enough to fill one panty liner) The next day it was gone. The day after that I got more spotting and this time is was just little brown clumps and only lasted like a half a day. I took a pregnancy test today and it was a BFN. I have been having light cramping as well. It just feels like normal period cramping but without all the blood. I usually have pretty regular periods and they are usually fairly heavy. I'm going to take another test on Tuesday but for now has anyone else been through this? Did you end up being pregnant? Could it be anything else? I'm not TTC but would be happy about another addition to my family.