with my first I was due for my period and that is all I did...spot very very lightly.... my friend suggested I may be pregnant.. so I went home and took a pregnancy test..and sure enough. I was!! SO this could be a sign that your pregnant!! =)
I almost always spot before AF actually begins. I also had spotting during my first pregnancy so really IMO it could be either. You could post a pic of a test you took and let everyone else take a look see.