It could be implantation bleeding. I have 4 kids. I got implantation bleeding with the last two of them. I remember the first time I had it, I was expecting my period around a Wednesday/Thursday, but on the Sunday before, I wiped and saw a little bit of blood. Then I thought,"Great, period." Then,"Hang on, it's not due yet". The vey light bleeding hung around on the Monday as well, then it went away. On the Thursday, I got a positive pregnancy test.