My girl and I had sex on August 15, 2011.Is there a positivity that she will become pregnant after 2 days?

My girl go to ob-gyne and had checked by ultrasound on Dec. 02, 2011 and the result is she's pregnant 15 weeks and 3 days. So,we had our first sex Aug. 15, 2011. Meaning after we had sex on Aug. 15, 2011 she became pregnant on Aug. 17, 2011? Is that possible? Or at least it should take a week untill she became... show more My girl go to ob-gyne and had checked by ultrasound on Dec. 02, 2011 and the result is she's pregnant 15 weeks and 3 days. So,we had our first sex Aug. 15, 2011. Meaning after we had sex on Aug. 15, 2011 she became pregnant on Aug. 17, 2011? Is that possible? Or at least it should take a week untill she became pregnant? Please help!
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