First, it sounds like your agreement is not ordered by a court, and therefore is unenforceable. Furthermore, if you have never had a paternity and custody case, then you have no custodial rights to the child. (When unmarried parties have a child, the father must petition the court to have his paternity acknowledged and a custody decision made).
As for child support, it depends on the child support worksheet. Her new husband's income is irrelevant.
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