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Pregnancy signs don't come so early. It is a possibility that she might be cramping due to the intercourse or she might be about to get her periods. It is very difficult to state here that she will get pregnant or not as you have not mentioned her last menstrual period date and date you had sex. So, I am unable to calculate if you were in the safe period when you had sex or not.
Wait for her periods. If she misses her periods, get urine pregnancy test done at home after 10 days of missing periods.
I would advise you to be cautious next time and to play safe.
I hope it helps.
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