Help! Could my girlfriend be pregnant?!

Hi! Good day!
I just want an answer in my situation. So we can have apiece of mind.
She gave me a bj, then I ejaculated and she swallowed it all, after that, we were still turned on, so I again masturbated in front of her but never touched the head of my genital (And I didn't notice any semen or any witish substance on my hands), but I feel a bit moist, maybe because of her saliva (not sure). Then I use a condom and applied drops of water-based lubricant, then I spread it around my genital with the condom on, but I later changed my mind so we didn't continue in having sex, but I fingered her once, with one finger and just a quick in-and-out. And now, it has been 3 days since, and she has been experiencing nausea, abdominal bloating, having vaginal secretions, pain in the pelvic area, and we learned that she was approximately ovulation on the day we did that.
So I just want to know if should we be worried? We are both paranoid and she has a board exam coming this June and she is so stressed and I don't want her to be distracted and disturbed while she is studying.
And my questions are, is there a possibility that I have pre-ejaculation in my hands even though I never touched the head of my genital? Are there any possibility of pregnancy in this situation?
I hope for an immediate reply. Thank you.

I never orgasmed. I just had pre cum*^.