Semen or discharge??

So the morning after I had unprotected sex I woke up and when I stood up white creamy watery discharge came out of me and it was like quite a lot

Could this of been semen? The guy said he didn’t cum in me but he wasn’t sober.

I feel like if it was it would have came out of me earlier

Or just discharge because I had sex?

EDIT // I also found out I had a UTI a few days after could this be why?