Implantation blood

Kristine
So, 2 days ago I had sex with my husband and started having lower and pain (cramping) for the last 2 days.... I noticed this morning I had some CM with a brownish/red blob in my undies and when I wiped I saw a little brownish tinged d/c. I am due for AF the 1st of the month.... What does implantation feel/look like? Help!