22M Did I Pee Myself or Have a Wet Dream?

I'm 22m, and woke up at 4:30 this morning to being in a patch of something wet and slightly sticky (ew, sorry, don't know how to phrase it in a way that is not cringey). I then went to the bathroom before masturbating and trying to fall asleep again for the next 1.5 hrs before waking up for the day. I haven't had a wet dream in years, and it's been even longer since I peed myself.

I used to wake up in the middle of the night to pee once, and I always woke up in time to get myself out of bed and go to the bathroom before going back to bed, but lately I have been sleeping through the night entirely. But I did drink a bit of water pretty soon before going to bed last night.

On the other hand, I just started dating someone for the first time in my life as of a few days ago^(1), and while I haven't had sex (neither with her nor anyone else, if that makes a difference), we've been hugging and cuddling a lot, so maybe this was just my hormones trying to respond to this new experience?

So my questions are as follows:

1. How do I know if it's pee or a wet dream?
2. If it's pee, should I be worried that I didn't wake up in time to actually go to the bathroom?
3. If it's semen, should I be worried because I'm no longer in puberty, afaik?

*^(\[1\] If you're worried about Covid, we're flatmates, so consider ourselves a 'nuclear unit' and don't distance around each other. And this is not a place to comment whether this relationship is a good idea, just about the medical questions I asked.)*