What Causes Pink Coating After Miscarriage?

I had a miscarriage on January 28,2014 i had unprotected sex on January 30 (because i didn't know i couldn't) my cycle suppose to came on February 7 but it didn't. Yesterday morning i started seen light pink blood but only when i wipe. Is this my period? Is this because of the miscarriage? Am i pregnant? Help me please