Ewcm?

Hi everyone. I had sex the night before and everything was cleared out by the next morning. Later that afternoon I wiped and allll of this came out. I didn't get any more after this one trip to the restroom but it was A LOT. Not like the normal amount of ewcm that I get spread out over a few days. This was just one and done. I just wanted to confirm that this was ewcm? Or if anyone had any other ideas what it could be? I don't think it's seminal fluid and I just had my yearly recently and I'm std free.