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Stress of foreclosure and pregnancy and marriage do not mix well.
Change your last name to his, give the baby his last name.
Work together to heal the financial issues you guys are facing first.
Have a wonderful wedding and reception when it is right for you two, not for your parents.
Have a beautiful future.
(From a grandfather with bad credit, with a lovely fiance' that has good credit that I don't want to hurt her financially, so I wait and work on finances and credit)