pulling out (assuming that's what you mean) has about a 20% failure rate and isn't considered contraception as that's about the same chance a woman has of becoming pregnant each month.
now, if you pulled out without ejaculating there would be a small chance of preejaculate containing sperm. This, however, would still require a lot of things to go right for her to get pregnant.
So...overall, chances are slim she got pregnant.
maybe 1% chance or so.
yes...nothing is 100% so I would still recommend using a condom to be sure..
not to mention protection from sexually transmitted infections.
and up to you.
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those symptoms are typically hormonally driven...and not necessarily by pregnancy.
commonly, those symptoms don't present until later in pregnancy...6-10 weeks or so.
so, I don't think that's what the symptoms are from.