brown discharge after period - TMI

This is a first for me. I am 32 years old. My period has been over for 10 days and is usually spot on with this chart. I've never had brown discharge after. Some days it has been tiny and others heavier and little globs of brown. 
Is this just extra old blood or maybe mean anything else? I had sex the day after my period ended. He went in a few times then put a condom on. Just odd to have this going on for me.