Which first? Call the lawyer or the mother?

They dated for a little over a year. Numerous fake pregnancies. When she came over with her "pregnancy paper" funnel(?) height didnt match weeks along. (I guess they're supposed to.) Well, dr said she was 3 weeks along, she said no, I'm 6. (Which would make it my fiances child if it was 6 weeks) Ok point being, ten years from now when we're married and etc, I don't want this nut coming at US for back pay child support. 10 years goes by at 500.00 a month, that is $60,000.00!!! I will not risk that and not a sinlge cent of mine will go to that woman and her child. She used a state grant for school to get implants. She is in every definition of the word, SCANDALOUS. Ok, well she hasn't gotten in contact with my fiance but we have seen her a couple times and each time she covers up this "baby." Ok, so my question is, should he talk to my lawyer first or call her and see how she is acting about all this? She also said she would have her friend sign the birth certificate stating it