NSFW Is it possible to become pregnant from... ? details inside.

My friend who’s a virgin told me that she’s worried about her maybe being pregnant. About 3 weeks ago she was fooling around with this guy she’s seeing and so they tried to insert his penis in her but he was too big. As they were doing that there was clear fluid also known as pre-cum coming out of his member and since he inserted his front member in her she’s worried that she might be pregnant because she’s been sick all past week and till this day she’s still sick. She has a cold and yesterday she had toothache (though I highly doubt that it has anything to do with it).
My concern is that could she possibly be pregnant. Her stomach hasn’t changed though… and she hasn’t been puking or anything.