Things are getting a wee bit bloody?

Ca
Hi ladies! To preface this, my period ended a week ago Monday. 
Last saturday my boyfriend and I went to have sex and I bled just the tiniest bit. It was brown, like old period blood. 
Today he was going down on me and he inadvertently earned his red wings. Same as last saturday, just a little more red but still dark, old looking blood. 
There's no pain, and as soon as it happens it's over. And I don't bleed later either. Should I worry? Do I need to do anything urgent?