Help!! TMI PIC!

Im
So I've been a little crampy all day because I've not been able to pee when I needed to but I've just been and when I wiped there was this on the tissue? As far as I know there's no chance I could be pregnant as I'm on bc and me and my boyfriend always use a condom anyway to be sure? I came off my period Sunday/Monday time too but usually I only have a day of old blood spotting or not at all after (the day after I actually stop) 
I'm just a bit baffled as to what this could be?