Implantation bleeding?

Stephanie
I current just finished my second round of clomid. My ovulation dates were December 26 through January 2. The past 3 days my boobs have been super sore and l have had a little cramping in my back. 
This morning when I wiped I had blood. But it wasn't very dark like other implantation bleeding that I've seen. Does anyone know what this could mean?