A question that kinda has me a little bit worried (precum,stomach pains,unprotected sex)

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)?

Plus, she was having stomach pains before we had sex. They went away for a little while (1 day or so) and now she says they're back and worse than before.

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