Comment: Plain and simple: you are not

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Plain and simple: you are not

Plain and simple:

you are not on the birth certificate. therefor you have no legal responsibility to this child.

You were not there for the first 2.5 years, so you have no emotional responsibility to this child.

You have more of a responsibility to your fiance. Do not mention this to her, and warn the said woman if she continues to contact you that you will be filing harassment charges against her.

If it is in fact your child, then it was her responsibility to contact you before she ever gave birth.

Again, do not take a paternity test unless you plan on throwing away your life with your fiance, and you want to end up giving half you salary away.