Kinda confused and worried but not sure if I should be

Hi...Just a question that's kinda been bothering me lately

Me and my girlfriend had unprotected sex a couple days ago. I usually use condoms but I had run out.

We took it slowly so I can be careful not to go all the way and risk pregnancy (not that I didn't by having sex in the first place) and we stopped before I did anything.

I guess my question would be :
It's hard to tell if you did pre-cum while having sex. I know that. So I'm not sure if I did or not. But she has another 2 weeks before her ovulation period and I know that there are trace amounts of sperm in pre-cum. I did not masturbate before and I did urinate a couple times before sex. But if there were any sperm in the pre-cum, what would be the odds to become pregnant that early in the ovulation period with the small amount of sperm (if any)?

I know that there is always the possibility of getting pregnant. I just want to set my mind at ease with the situation.

Any help would be good I guess

Thanks