Was it cum?

On August 1st at 1:00 am I had sex, I'm on birth control but we don't use condoms.

He came on my stomach as usual and then we fell back asleep after he wiped it off, but at 3:30 am I woke up and went to the washroom, putting clothes on to walk there, but when I pulled my underwear down, they were wet.

Now the walk to the bathroom is only about 15 seconds long- I was really sweaty, but I have a hard time believing the crotch of my underwear was wet from sweat.

Do you think it's possible he came on the outside of my vagina/on my labia and neither he or I noticed? Like he usually & off there too just in case, but I don't remember. But he's never forgotten before.

And, long story short I did some weird stuff with my birth control pills this cycle that would've really messed it up, and I forgot to take it last night and the night before so I just took them both now.

I have one app saying I'm fertile and ovulate tomorrow, and one saying I ovulated a few days ago and there's a very low pregnancy chance IF he came inside me which I'm 99% sure he didn't at all, but I'm not sure.

Do you think it could've been sweat? It wasn't cotton underwear so it wasn't a highly absorbable material, it was more silky. But I have a hard time believing it was cum, and he said I was extremely wet but could I have been so wet that it went into my underwear in 15 seconds, 2 hours after sex?

I'm just confused and I'm not sure if I should stress myself out with thinking I could get pregnant, I should be getting my period in about 1 week according to my pills but I guess I'm just looking for advice.

Aghhh.

Also not sure if this matters but sex that night/morning bruised my cervix. It was mind blowing but I was in so much pain from it for awhile.

Edit: it definitely wasn't pee.