are pregnancy calculators right or sometimes wrong?

because my girlfriend found out she was pregnant on1/27/09 and i used a pregnancy calculator and it said that my girlfriend’s due date was on 11/3/09 is that right or wrong?
well actually her 2nd period was on 1/27/09

August 1, 2010 Post Under Signs Of Pregnancy - Read More

One Response to “are pregnancy calculators right or sometimes wrong?”

  1. nydp02 says:

    It should go by her last period. You would know for sure when she gets an ultrasound.

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