Yeah I get that, but can you get a mucousy discharge from anal sex even with a condom? I dont have any reason to believe he took it off except for the cum like substance when I went to the bathroom. I had felt it was on with my hand multiple times during sex and wasnt worried at all until later when I went to the bathroom.
If you can't figure if he had it off when he was inside you, no one else will be able to here. You will have to take a test for conclusive results.