There is some chance: It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A urine pregnancy test gives a reliable result if done correctly. One can test about 3 weeks after sex (when conception might have been), or 1 week after missing a period. That said, back pain is not a symptom of a brand new pregnancy before a missed period.
Answered 7/9/2017
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