Spotting and avoiding pregnancy

Melissa
I don't know if it's spotting or not and I hope not but me and my bf had sex last week 2days before my due date unprotected with pull out method my period was 1 day late and my period ended before yestraday and today I saw this soft brownish thing in my underwear and it wasn't number 2 is that spotting?please tell me I'm not pregnant also I fel kind of nauseous today