If you do not have an itch, burn or smell, it sounds like it is just your combined fluids leaking out. The scientific term for this is 'flow-back'
Your vagina in the unaroused state is flat, with the walls collapsed onto each others, like a firehose on a fire truck, without water in it. So if your vagina went to the unaroused state, it could have trapped some fluid up there. Maybe your pelvis just did not tilt in the right way to let it out before you went into the unaroused state.
His semen is jelly like when he ejaculates. The heat at the top of your vagina will liquify it over the next 30 minutes to allow the sperm to escape. Sometimes the consistency of his semen is a bit worse, and it will take longer for it to liquify.
You can do kegels on the toilet to squeeze out as much of his semen as you can after sex.
Take care!